Annual report pursuant to Section 13 and 15(d)

CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail)

v3.3.1.900
CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Cost    
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 1,131  
Due after one year through three years 425  
Due after three years through five years 14  
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis 75  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,645  
Equity securities 349  
Marketable Securities, Amortized Cost, Total 1,994 $ 992
Estimated Fair Value    
Due in one year or less 1,131  
Due after one year through three years 423  
Due after three years through five years 15  
Due after five years 74  
Marketable Securities, Debt Maturities, Fair Value, Total 1,643  
Equity securities 353  
Marketable securities 1,996 992
Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 2,047 1,075
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 710 340
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 1,305 671
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 32 64
Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 1,996 992
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 691 321
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 1,305 671
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Other Long-term Investments | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 51 83
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 19 19
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 32 64
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 340 321
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 340 321
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 74 89
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 74 89
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 861 534
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 861 534
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
U.S. state and local municipal debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 2 2
U.S. state and local municipal debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
U.S. state and local municipal debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 2 2
U.S. state and local municipal debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 2 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 2 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 366 44
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 366 44
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 $ 0
Carbon credit investments | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 351  
Carbon credit investments | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 351  
Carbon credit investments | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 0  
Carbon credit investments | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure $ 0