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Stockholders' Equity - Change in AOCI Gain (Loss) by Component (Net of Tax) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Mar. 31, 2018 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | $ (1,263) | $ (926) | $ (949) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  | $ (11) |  | $ 0
Effects from transfer of securities held to maturity to available for sale | 888 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 1,171 | (302) | 81 |  |  |
Amounts reclassified from AOCI into earnings | 360 | 84 | (58) |  |  |
Other comprehensive income (loss), net of tax | 1,531 | (136) | 23 |  |  |
AOCI ending balance | 1,156 | (1,263) | (926) |  |  |
One time transfer of held to maturity securities | 0 | 36,771 |  |  |  |
AOCI, pre-tax | 1,200 |  |  |  |  |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | (439) | 17 | (4) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | 3
Effects from transfer of securities held to maturity to available for sale | 724 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 670 | (293) | 62 |  |  |
Amounts reclassified from AOCI into earnings | (20) | 159 | (41) |  |  |
Other comprehensive income (loss), net of tax | 650 | (459) | 21 |  |  |
AOCI ending balance | 935 | (439) | 17 |  |  |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Held to Maturity |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | (190) | (524) | (621) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | (113)
Effects from transfer of securities held to maturity to available for sale | 164 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 |  |  |
Amounts reclassified from AOCI into earnings | 26 | 40 | 97 |  |  |
Other comprehensive income (loss), net of tax | 26 | 447 | 97 |  |  |
AOCI ending balance | 0 | (190) | (524) |  |  |
Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | (418) | (281) | (78) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | (63)
Effects from transfer of securities held to maturity to available for sale | 0 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 414 | 38 | (95) |  |  |
Amounts reclassified from AOCI into earnings | 358 | (112) | (108) |  |  |
Other comprehensive income (loss), net of tax | 772 | (74) | (203) |  |  |
AOCI ending balance | 354 | (418) | (281) |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | (177) | (138) | (222) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | 0
Effects from transfer of securities held to maturity to available for sale | 0 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 70 | (39) | 84 |  |  |
Amounts reclassified from AOCI into earnings | 0 | 0 | 0 |  |  |
Other comprehensive income (loss), net of tax | 70 | (39) | 84 |  |  |
AOCI ending balance | (107) | (177) | (138) |  |  |
Other |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
AOCI beginning balance | (39) | 0 | (24) |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | (28)
Effects from transfer of securities held to maturity to available for sale | 0 |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 17 | (8) | 30 |  |  |
Amounts reclassified from AOCI into earnings | (4) | (3) | (6) |  |  |
Other comprehensive income (loss), net of tax | 13 | (11) | 24 |  |  |
AOCI ending balance | (26) | (39) | 0 |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | $ (201)
Effects from transfer of securities held to maturity to available for sale | 888 |  |  |  |  |
ASU 2017-12 |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | $ 82 |
One time transfer of held to maturity securities |  |  |  |  | 9,000 |
ASU 2017-12 | Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | 82 |
AOCI, pre-tax |  |  |  |  | 107 |
ASU 2017-12 | Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | (325) |
ASU 2017-12 | Accumulated Net Unrealized Investment Gain (Loss) | Securities Held to Maturity |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | 407 |
ASU 2017-12 | Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | 0 |
ASU 2017-12 | Foreign Currency Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | 0 |
ASU 2017-12 | Other |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Effects from transfer of securities held to maturity to available for sale |  |  |  |  | $ 0 |
Net investment hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Gains (losses) recorded in AOCI | $ (49) | $ 150 | $ (143) |  |  |

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