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Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative Assets: |  |
Derivative assets | $ 1,109 | $ 728
Derivative Liabilities: |  |
Derivative liabilities | (1,611) | (1,515)
Net total derivatives | (502) | (787)
Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 1,098 | 726
Derivative Liabilities: |  |
Derivative liabilities | (345) | (160)
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 10 | 2
Derivative Liabilities: |  |
Derivative liabilities | (852) | (988)
Other [Member] |  |
Derivative Assets: |  |
Derivative assets | 1 |
Derivative Liabilities: |  |
Derivative liabilities | (8) | (2)
Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (406) | (365)
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (280) | (89)
Net total derivatives | (280) | (89)
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 1,016 | 696
Derivative Liabilities: |  |
Derivative liabilities | (835) | (929)
Net total derivatives | 181 | (233)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (280) | (89)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 1,006 | 694
Derivative Liabilities: |  |
Derivative liabilities |  | (3)
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 10 | 2
Derivative Liabilities: |  |
Derivative liabilities | (835) | (926)
Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 93 | 32
Derivative Liabilities: |  |
Derivative liabilities | (496) | (497)
Net total derivatives | (403) | (465)
Trading [Member] | Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 92 | 32
Derivative Liabilities: |  |
Derivative liabilities | (65) | (68)
Trading [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (17) | (62)
Trading [Member] | Other [Member] |  |
Derivative Assets: |  |
Derivative assets | 1 |
Derivative Liabilities: |  |
Derivative liabilities | (8) | (2)
Trading [Member] | Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | $ (406) | $ (365)

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