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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale debt and other securities:    
Amortized Cost $ 34,982 $ 34,966
Unrealized Gains 2,568 1,105
Unrealized Losses (37) (43)
Fair Value [1] 37,513 36,028
Held-to-maturity securities:    
Amortized Cost [2] 11 17
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 11 17
Trading debt securities 560 297
Equity securities 313 564
FHLB, restricted stock holdings 40 76
FRB, restricted stock holdings 482 478
DTCC, restricted stock holdings 2 2
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 74 74
Unrealized Gains 4 1
Unrealized Losses 0 0
Fair Value 78 75
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 17 18
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 17 18
Held-to-maturity securities:    
Amortized Cost 9 15
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 9 15
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 11,147 13,746
Unrealized Gains 768 388
Unrealized Losses (8) (19)
Fair Value 11,907 14,115
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 16,745 15,141
Unrealized Gains 1,481 564
Unrealized Losses (5) (12)
Fair Value 18,221 15,693
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,323 3,242
Unrealized Gains 267 123
Unrealized Losses 0 0
Fair Value 3,590 3,365
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,152 2,189
Unrealized Gains 48 29
Unrealized Losses (24) (12)
Fair Value 3,176 2,206
Held-to-maturity securities:    
Amortized Cost 2 2
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 2 2
Other securities    
Available-for-sale debt and other securities:    
Amortized Cost 524 556
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value $ 524 $ 556
[1] Amortized cost of $34,982 and $34,966 at December 31, 2020 and 2019, respectively.
[2] Fair value of $11 and $17 at December 31, 2020 and 2019, respectively.