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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