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Stockholders' Equity - Reclassifications from AOCI (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income | $ 23,340 | $ 22,875 | $ 22,460
Interest expense | 5,173 | 4,301 | 2,762
Non-interest income | 718 | 1,002 | 542
Income from continuing operations before income taxes | 6,874 | 7,318 | 5,492
Income tax provision (benefit) | 1,341 | 1,293 | 3,375
Net income | 5,546 | 6,015 | 1,982
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income | (360) | (84) | 58
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Non-interest income | 26 | (209) | 65
Income tax provision (benefit) | 6 | (50) | 24
Net income | 20 | (159) | 41
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Held to Maturity |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income | (35) | (53) | (150)
Income tax provision (benefit) | (9) | (13) | (53)
Net income | (26) | (40) | (97)
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income from continuing operations before income taxes | (470) | 147 | 173
Income tax provision (benefit) | (112) | 35 | 65
Net income | (358) | 112 | 108
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest rate contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income | (171) | (91) | 145
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign exchange contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income | 44 | 47 | 27
Interest expense | (2) | 0 | 0
Non-interest income | (341) | 191 | 1
Other | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income from continuing operations before income taxes | 5 | 4 | 9
Income tax provision (benefit) | 1 | 1 | 3
Net income | $ 4 | $ 3 | $ 6

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