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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Available-for-sale debt and other securities:    
Amortized Cost $ 35,780 $ 34,966
Unrealized Gains 2,861 1,105
Unrealized Losses (42) (43)
Fair Value [1] 38,599 36,028
Held-to-maturity securities:    
Amortized Cost [2] 16 17
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 16 17
Trading debt securities 526 297
Equity securities 273 564
FHLB, restricted stock holdings 68 76
FRB, restricted stock holdings 478 478
DTCC, restricted stock holdings 2 2
U.S. Treasury and federal agency 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 14 15
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 14 15
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 2,732 2,189
Unrealized Gains 25 29
Unrealized Losses (42) (12)
Fair Value 2,715 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 548 556
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 548 556
Residential mortgage backed securities | Agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 12,907 13,746
Unrealized Gains 1,002 388
Unrealized Losses 0 (19)
Fair Value 13,909 14,115
Commercial mortgage-backed securities | Agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 16,279 15,141
Unrealized Gains 1,612 564
Unrealized Losses 0 (12)
Fair Value 17,891 15,693
Commercial mortgage-backed securities | Non-agency mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,223 3,242
Unrealized Gains 218 123
Unrealized Losses 0 0
Fair Value $ 3,441 $ 3,365
[1] Amortized cost of $35,780 and $34,966 at June 30, 2020 and December 31, 2019, respectively.
[2] Fair value of $16 and $17 at June 30, 2020 and December 31, 2019, respectively.