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Stockholders' Equity - Change in AOCI Gain (Loss) by Component (Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Jan. 01, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | $ 1,156 | $ (1,263) |  |
Cumulative effects from the adoption of the CECL standard |  |  | $ (2,192) | $ (11)
Other comprehensive income (loss) before reclassifications |  | 450 |  |
Amounts reclassified from AOCI into earnings |  | 153 |  |
Other comprehensive income (loss), net of tax | 2,531 | 603 |  |
AOCI ending balance | 3,679 | (660) |  |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 935 | (439) |  |
Cumulative effects from the adoption of the CECL standard |  |  | (8) |
Other comprehensive income (loss) before reclassifications | 1,224 | 310 |  |
Amounts reclassified from AOCI into earnings | 0 | (18) |  |
Other comprehensive income (loss), net of tax | 1,224 | 292 |  |
AOCI ending balance | 2,151 | (147) |  |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Held to Maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  | (190) |  |
Other comprehensive income (loss) before reclassifications |  | 0 |  |
Amounts reclassified from AOCI into earnings |  | 6 |  |
Other comprehensive income (loss), net of tax |  | 6 |  |
AOCI ending balance |  | (184) |  |
Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 354 | (418) |  |
Cumulative effects from the adoption of the CECL standard |  |  | 0 |
Other comprehensive income (loss) before reclassifications | 1,695 | 111 |  |
Amounts reclassified from AOCI into earnings | (321) | 166 |  |
Other comprehensive income (loss), net of tax | 1,374 | 277 |  |
AOCI ending balance | 1,728 | (141) |  |
Foreign Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (107) | (177) |  |
Cumulative effects from the adoption of the CECL standard |  |  | 0 |
Other comprehensive income (loss) before reclassifications | (67) | 30 |  |
Amounts reclassified from AOCI into earnings | 0 | 0 |  |
Other comprehensive income (loss), net of tax | (67) | 30 |  |
AOCI ending balance | (174) | (147) |  |
Other |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (26) | (39) |  |
Cumulative effects from the adoption of the CECL standard |  |  | 0 |
Other comprehensive income (loss) before reclassifications | 0 | (1) |  |
Amounts reclassified from AOCI into earnings | 0 | (1) |  |
Other comprehensive income (loss), net of tax | 0 | (2) |  |
AOCI ending balance | (26) | (41) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 1,156 |  |  |
Cumulative effects from the adoption of the CECL standard |  |  | $ (8) |
Other comprehensive income (loss) before reclassifications | 2,852 |  |  |
Amounts reclassified from AOCI into earnings | (321) |  |  |
Other comprehensive income (loss), net of tax | 2,531 |  |  |
AOCI ending balance | 3,679 |  |  |
Net investment hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Gains (losses) recorded in AOCI | $ 142 | $ (34) |  |

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