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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale debt and other securities:    
Amortized Cost $ 36,308 $ 34,982
Unrealized Gains 1,665 2,568
Unrealized Losses (103) (37)
Fair Value [1] 37,870 37,513
Held-to-maturity securities:    
Amortized Cost 8 11
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 8 11
Trading debt securities 685 560
Equity securities 329 313
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 90 74
Unrealized Gains 2 4
Unrealized Losses 0 0
Fair Value 92 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 6 9
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 6 9
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 9,191 11,147
Unrealized Gains 474 768
Unrealized Losses (13) (8)
Fair Value 9,652 11,907
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 18,468 16,745
Unrealized Gains 962 1,481
Unrealized Losses (66) (5)
Fair Value 19,364 18,221
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,802 3,323
Unrealized Gains 183 267
Unrealized Losses (6) 0
Fair Value 3,979 3,590
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,221 3,152
Unrealized Gains 44 48
Unrealized Losses (18) (24)
Fair Value 4,247 3,176
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 518 524
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 518 524
FHLB, restricted stock holdings 31 40
FRB, restricted stock holdings 485 482
DTCC, restricted stock holdings $ 2 $ 2
[1] Amortized cost of $36,308 and $34,982 at September 30, 2021 and December 31, 2020, respectively.