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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | $ 1,156 |
Other comprehensive income (loss), net of tax | $ 302 | $ 830 | 2,833 | $ 1,433
AOCI ending balance | 3,981 |  | 3,981 |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 2,151 | (147) | 935 | (439)
Other comprehensive income (loss) before reclassifications | 222 | 284 | 1,446 | 594
Amounts reclassified from AOCI into earnings | 0 | (12) | 0 | (30)
Other comprehensive income (loss), net of tax | 222 | 272 | 1,446 | 564
AOCI ending balance | 2,373 | 125 | 2,373 | 125
Accumulated Net Unrealized Investment Gain (Loss) | Securities Held to Maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  | (184) |  | (190)
Other comprehensive income (loss) before reclassifications |  | 0 |  | 0
Amounts reclassified from AOCI into earnings |  | 6 |  | 12
Other comprehensive income (loss), net of tax |  | 6 |  | 12
AOCI ending balance |  | (178) |  | (178)
Hedging Relationships |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 1,728 | (141) | 354 | (418)
Other comprehensive income (loss) before reclassifications | (60) | 406 | 1,635 | 517
Amounts reclassified from AOCI into earnings | 117 | 131 | (204) | 297
Other comprehensive income (loss), net of tax | 57 | 537 | 1,431 | 814
AOCI ending balance | 1,785 | 396 | 1,785 | 396
Foreign Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (174) | (147) | (107) | (177)
Other comprehensive income (loss) before reclassifications | 23 | 15 | (44) | 45
Amounts reclassified from AOCI into earnings | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 23 | 15 | (44) | 45
AOCI ending balance | (151) | (132) | (151) | (132)
Other |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (26) | (41) | (26) | (39)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | (1)
Amounts reclassified from AOCI into earnings | 0 | 0 | 0 | (1)
Other comprehensive income (loss), net of tax | 0 | 0 | 0 | (2)
AOCI ending balance | (26) | (41) | (26) | (41)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 3,679 | (660) | 1,156 | (1,263)
Other comprehensive income (loss) before reclassifications | 185 | 705 | 3,037 | 1,155
Amounts reclassified from AOCI into earnings | 117 | 125 | (204) | 278
Other comprehensive income (loss), net of tax | 302 | 830 | 2,833 | 1,433
AOCI ending balance | 3,981 | 170 | 3,981 | 170
Net investment hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Gains (losses) recorded in AOCI | $ (8) | $ 53 | 134 | $ 19
Cumulative effects from adoption of the CECL standard | Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | (8) |
Cumulative effects from adoption of the CECL standard | Hedging Relationships |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | 0 |
Cumulative effects from adoption of the CECL standard | Foreign Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | 0 |
Cumulative effects from adoption of the CECL standard | Other |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | 0 |
Cumulative effects from adoption of the CECL standard | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | $ (8) |

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