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Summary of Marketable Securities (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Marketable Securities [Line Items] |  |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 1,547 |  | $ 1,425
Trading Securities, Gross Unrealized Gain | 0 |  | 9
Trading Securities, Gross Unrealized Loss | (156) |  | (5)
Trading Securities | 1,391 |  | 1,429
Available-for-sale Securities, Amortized Cost Basis | 986 |  | 569
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) |  | (3)
Available-for-sale Securities, Current | 989 |  | 567
Total Amortized Cost | 2,533 |  | 1,994
Marketable Securities, Gross Unrealized Gain | 4 |  | 10
Marketable Securities, Gross Unrealized Loss | (157) |  | (8)
Total Estimated Fair Value | 2,380 |  | 1,996
Trading Securities, Change in Unrealized Holding Gain (Loss) | (156) | $ 1 |
U.S. government and agency debt securities |  |  |
Schedule of Marketable Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 335 |  | 341
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | (1)
Available-for-sale Securities, Current | 337 |  | 340
Mortgage and asset-backed debt securities |  |  |
Schedule of Marketable Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 72 |  | 74
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | (1)
Available-for-sale Securities, Current | 72 |  | 74
Corporate debt securities |  |  |
Schedule of Marketable Securities [Line Items] |  |  |
Trading Securities, Short-term Investments, Amortized Cost | 910 |  | 715
Trading Securities, Gross Unrealized Gain | 0 |  | 0
Trading Securities, Gross Unrealized Loss | 0 |  | 0
Trading Securities | 910 |  | 715
Available-for-sale Securities, Amortized Cost Basis | 572 |  | 147
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) |  | (1)
Available-for-sale Securities, Current | 573 |  | 146
U.S. state and local municipal debt 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
Equity Securities [Member] |  |  |
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
Foreign Government Debt Securities [Member] |  |  |
Schedule of Marketable Securities [Line Items] |  |  |
Trading Securities, Short-term Investments, Amortized Cost | 197 |  | 363
Trading Securities, Gross Unrealized Gain | 0 |  | 0
Trading Securities, Gross Unrealized Loss | 0 |  | 0
Trading Securities | 197 |  | 363
Available-for-sale Securities, Amortized Cost Basis | 3 |  | 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 | 3 |  | 3
Carbon Credit Investments [Member] |  |  |
Schedule of Marketable Securities [Line Items] |  |  |
Trading Securities, Short-term Investments, Amortized Cost | 440 |  | 347
Trading Securities, Gross Unrealized Gain | 0 |  | 9
Trading Securities, Gross Unrealized Loss | (156) |  | (5)
Trading Securities | $ 284 |  | $ 351

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