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Investment Securities - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Pledged securities not separately reported $ 49,480 $ 38,870  
Investment securities available-for-sale 53,815 45,148  
Losses from other-than-temporary impairment 0 3 $ 0
Gross pre-tax unrealized losses $ 169    
Number of securities in loss position | security 622    
Agency MBS      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Debt securities, available-for-sale, transferred security, at carrying value $ 3,980 2,130 496
Debt securities, available-for-sale, unrealized loss 49 53 3
ABS and municipal bonds      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Securities sold   26,000 12,200
Pre-tax gain (loss) on sale of securities   9 (39)
Non-U.S. debt securities, mortgage-backed securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Investment securities available-for-sale 1,980 1,682  
Losses from other-than-temporary impairment $ 1 3 $ 1
Accounting Standards Update 2017-12      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Investment securities available-for-sale   1,200  
Loss from sale of HTM securities   $ 36  
Minimum | Agency MBS      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Debt securities, available-for-sale, securities transferred, Security Term 10 years    
Maximum | Agency MBS      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Debt securities, available-for-sale, securities transferred, Security Term 42 years