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)

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CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Cost    
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 112  
Due after one year through three years 453  
Due after three years through five years 21  
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis 73  
Marketable Securities, Debt Maturities, Amortized Cost, Total 659  
Equity securities 77  
Marketable Securities, Amortized Cost, Total 736 $ 1,083
Estimated Fair Value    
Due in one year or less 112  
Due after one year through three years 449  
Due after three years through five years 21  
Due after five years 74  
Marketable Securities, Debt Maturities, Fair Value, Total 656  
Equity securities 93  
Marketable securities 749 1,091
Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 774 1,122
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 395 420
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 373 689
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 6 13
Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 749 1,091
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 376 402
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 373 689
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 25 31
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 19 18
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 6 13
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 283 312
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 283 312
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 86 91
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 86 91
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 276 593
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 276 593
Corporate 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 9 3
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 9 3
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(1) | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 93 90
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 93 90
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 0 0
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure $ 0 $ 0