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Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative Assets: |  |
Derivative assets | $ 949 | $ 728
Derivative Liabilities: |  |
Derivative liabilities | (1,318) | (1,515)
Net total derivatives | (369) | (787)
Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 930 | 726
Derivative Liabilities: |  |
Derivative liabilities | (272) | (160)
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 18 | 2
Derivative Liabilities: |  |
Derivative liabilities | (742) | (988)
Other [Member] |  |
Derivative Assets: |  |
Derivative assets | 1 |
Derivative Liabilities: |  |
Derivative liabilities | (11) | (2)
Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (293) | (365)
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (207) | (89)
Net total derivatives | (207) | (89)
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 875 | 696
Derivative Liabilities: |  |
Derivative liabilities | (731) | (929)
Net total derivatives | 144 | (233)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (207) | (89)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 857 | 694
Derivative Liabilities: |  |
Derivative liabilities |  | (3)
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 18 | 2
Derivative Liabilities: |  |
Derivative liabilities | (731) | (926)
Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 74 | 32
Derivative Liabilities: |  |
Derivative liabilities | (380) | (497)
Net total derivatives | (306) | (465)
Trading [Member] | Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 73 | 32
Derivative Liabilities: |  |
Derivative liabilities | (65) | (68)
Trading [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (11) | (62)
Trading [Member] | Other [Member] |  |
Derivative Assets: |  |
Derivative assets | 1 |
Derivative Liabilities: |  |
Derivative liabilities | (11) | (2)
Trading [Member] | Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | $ (293) | $ (365)

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