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, 2018
Dec. 31, 2017
Cost    
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 268  
Due after one year through three years 448  
Due after three years through five years 22  
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis 73  
Marketable Securities, Debt Maturities, Amortized Cost, Total 811  
Equity securities 2  
Marketable Securities, Amortized Cost, Total 813 $ 736
Estimated Fair Value    
Due in one year or less 267  
Due after one year through three years 447  
Due after three years through five years 22  
Due after five years 72  
Marketable Securities, Debt Maturities, Fair Value, Total 808  
Equity securities 2  
Marketable securities 810 749
Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 831 774
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 316 395
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 513 373
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure 2 6
Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 810 749
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure 297 376
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure 513 373
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 21 25
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 2 6
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring    
Estimated Fair Value    
Investments, Fair Value Disclosure 297 283
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 297 283
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 81 86
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 81 86
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 410 276
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 410 276
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 20 9
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 20 9
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
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Estimated Fair Value    
Investments, Fair Value Disclosure   93
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Estimated Fair Value    
Investments, Fair Value Disclosure   0
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Estimated Fair Value    
Investments, Fair Value Disclosure   $ 0