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Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Assets: |  |
Derivative assets | $ 246 | $ 179
Derivative Liabilities: |  |
Derivative liabilities | (731) | (801)
Net total derivatives | (485) | (622)
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 242 | 176
Derivative Liabilities: |  |
Derivative liabilities | (606) | (673)
Net total derivatives | (364) | (497)
Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 4 | 3
Derivative Liabilities: |  |
Derivative liabilities | (125) | (128)
Net total derivatives | (121) | (125)
Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 243 | 173
Derivative Liabilities: |  |
Derivative liabilities | (24) | (79)
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 239 | 170
Derivative Liabilities: |  |
Derivative liabilities |  | (34)
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative Assets: |  |
Derivative assets | 4 | 3
Derivative Liabilities: |  |
Derivative liabilities | (24) | (45)
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Assets: |  |
Derivative assets | 3 | 6
Derivative Liabilities: |  |
Derivative liabilities | (606) | (665)
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Assets: |  |
Derivative assets | 3 | 6
Derivative Liabilities: |  |
Derivative liabilities | (606) | (639)
Cross-Currency Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities |  | (26)
Floor Income Contracts [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (99) | (53)
Floor Income Contracts [Member] | Trading [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (99) | (53)
Other [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | (2) | (4)
Other [Member] | Trading [Member] |  |
Derivative Liabilities: |  |
Derivative liabilities | $ (2) | $ (4)

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