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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale debt and other securities:    
Amortized Cost $ 35,963 $ 34,982
Unrealized Gains 1,793 2,568
Unrealized Losses (161) (37)
Fair Value [1] 37,595 37,513
Held-to-maturity securities:    
Amortized Cost [2] 10 11
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 10 11
Trading debt securities 728 560
Equity securities 315 313
FHLB, restricted stock holdings 36 40
FRB, restricted stock holdings 483 482
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 3 4
Unrealized Losses 0 0
Fair Value 77 78
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 18 17
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 18 17
Held-to-maturity securities:    
Amortized Cost 9 9
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 9 9
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,262 3,152
Unrealized Gains 50 48
Unrealized Losses (29) (24)
Fair Value 3,283 3,176
Held-to-maturity securities:    
Amortized Cost 1 2
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 1 2
Other securities    
Available-for-sale debt and other securities:    
Amortized Cost 521 524
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 521 524
Residential mortgage backed securities | Agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 11,536 11,147
Unrealized Gains 594 768
Unrealized Losses (35) (8)
Fair Value 12,095 11,907
Commercial mortgage-backed securities | Agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 17,357 16,745
Unrealized Gains 938 1,481
Unrealized Losses (97) (5)
Fair Value 18,198 18,221
Commercial mortgage-backed securities | Non-agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,195 3,323
Unrealized Gains 208 267
Unrealized Losses 0 0
Fair Value $ 3,403 $ 3,590
[1] Amortized cost of $35,963 and $34,982 at March 31, 2021 and December 31, 2020, respectively.
[2] Fair value of $10 and $11 at March 31, 2021 and December 31, 2020, respectively.