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Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 400 | $ 507
Trading Securities, Gross Unrealized Gain | 46 | 10
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 446 | 517
Available-for-sale Securities, Amortized Cost Basis | 597 | 576
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (3)
Available-for-sale Securities, Current | 597 | 574
Total Amortized Cost | 997 | 1,083
Marketable Securities, Gross Unrealized Gain | 47 | 11
Marketable Securities, Gross Unrealized Loss | (1) | (3)
Total Estimated Fair Value | 1,043 | 1,091
Corporate debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 159 | 427
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 159 | 427
Available-for-sale Securities, Amortized Cost Basis | 210 | 167
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (1)
Available-for-sale Securities, Current | 211 | 166
Carbon credit investments |  |
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 241 | 80
Trading Securities, Gross Unrealized Gain | 46 | 10
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 287 | 90
U.S. government and agency debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 286 | 314
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (2)
Available-for-sale Securities, Current | 285 | 312
Mortgage and asset-backed debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 90 | 90
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 90 | 91
U.S. state and local municipal debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |
Available-for-sale Securities, Current | 0 |
Equity securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2 | 2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 2 | 2
Non-U.S. government debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 9 | 3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | $ 9 | $ 3

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