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Derivative Financial Instruments - Impact of Derivatives on Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Assets: |  |
Derivative assets | $ 276 | $ 357
Derivative Liabilities: |  |
Derivative liabilities | (269) | (533)
Net total derivatives | 7 | (176)
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 273 | 351
Derivative Liabilities: |  |
Derivative liabilities | (121) | (322)
Net total derivatives | 152 | 29
Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 3 | 6
Derivative Liabilities: |  |
Derivative liabilities | (148) | (211)
Net total derivatives | (145) | (205)
Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 263 | 329
Derivative Liabilities: |  |
Derivative liabilities | (9) | (14)
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 260 | 323
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 3 | 6
Derivative Liabilities: |  |
Derivative liabilities | (9) | (14)
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 13 | 28
Derivative Liabilities: |  |
Derivative liabilities | (121) | (322)
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 13 | 28
Derivative Liabilities: |  |
Derivative liabilities | (121) | (322)
Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (139) | (197)
Floor Income Contracts [Member] | Trading [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | $ (139) | $ (197)

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