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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Available-for-sale debt and other securities:    
Amortized Cost $ 36,081 $ 34,982
Unrealized Gains 2,014 2,568
Unrealized Losses (83) (37)
Fair Value [1] 38,012 37,513
Held-to-maturity securities:    
Amortized Cost 10 11
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value [2] 10 11
Trading debt securities 711 560
Equity securities 341 313
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 105 74
Unrealized Gains 2 4
Unrealized Losses 0 0
Fair Value 107 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
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 10,256 11,147
Unrealized Gains 573 768
Unrealized Losses (20) (8)
Fair Value 10,809 11,907
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 18,142 16,745
Unrealized Gains 1,188 1,481
Unrealized Losses (36) (5)
Fair Value 19,294 18,221
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,276 3,323
Unrealized Gains 203 267
Unrealized Losses 0 0
Fair Value 3,479 3,590
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,764 3,152
Unrealized Gains 48 48
Unrealized Losses (27) (24)
Fair Value 3,785 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 520 524
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 520 524
FHLB, restricted stock holdings 33 40
FRB, restricted stock holdings 485 482
DTCC, restricted stock holdings $ 2 $ 2
[1] Amortized cost of $36,081 and $34,982 at June 30, 2021 and December 31, 2020, respectively.
[2] Fair value of $10 and $11 at June 30, 2021 and December 31, 2020, respectively.