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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