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Stockholders' Equity - Reclassifications from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest income | $ 6,025 | $ 5,791
Interest expense | 1,084 | 1,301
Non-interest income | 145 | 157
Income from continuing operations before income taxes | (1,903) | 1,719
Income tax provision (benefit) | (563) | 309
Net income (loss) | (1,340) | 1,412
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net income (loss) | 321 | (153)
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 | 0 | 24
Income tax provision (benefit) | 0 | 6
Net income (loss) | 0 | 18
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 | 0 | (8)
Income tax provision (benefit) | 0 | (2)
Net income (loss) | 0 | (6)
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 | 424 | (220)
Income tax provision (benefit) | 103 | (54)
Net income (loss) | 321 | (166)
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 | 26 | (60)
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 | 7 | 12
Interest expense | (1) | 0
Non-interest income | 392 | (172)
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 | 0 | 1
Income tax provision (benefit) | 0 | 0
Net income (loss) | $ 0 | $ 1

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