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Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 77 | $ 152
Trading Securities, Gross Unrealized Gain | 0 | 16
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 77 | 168
Available-for-sale Securities, Amortized Cost Basis | 675 | 584
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (8) | (4)
Available-for-sale Securities, Current | 667 | 581
Total Amortized Cost | 752 | 736
Marketable Securities, Gross Unrealized Gain | 0 | 17
Marketable Securities, Gross Unrealized Loss | (8) | (4)
Total Estimated Fair Value | 744 | 749
Corporate debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 75 | 75
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 75 | 75
Available-for-sale Securities, Amortized Cost Basis | 277 | 201
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (2) | (1)
Available-for-sale Securities, Current | 275 | 201
Carbon credit investments |  |
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost |  | 77
Trading Securities, Gross Unrealized Gain |  | 16
Trading Securities, Gross Unrealized Loss |  | 0
Trading Securities |  | 93
U.S. government and agency debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 297 | 286
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (5) | (3)
Available-for-sale Securities, Current | 292 | 283
Mortgage and asset-backed debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 85 | 86
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | 0
Available-for-sale Securities, Current | 84 | 86
Equity securities |  |
Schedule of Marketable Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 2 |
Trading Securities, Gross Unrealized Gain | 0 |
Trading Securities, Gross Unrealized Loss | 0 |
Trading Securities | 2 |
Available-for-sale Securities, Amortized Cost Basis |  | 2
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 |  | 2
Non-U.S. government debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 16 | 9
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 | $ 16 | $ 9

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