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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale:    
Amortized cost $ 99,503 $ 87,435
Gross unrealized, Gain 3,159 1,353
Gross unrealized, Loss 694 238
Available-for-sale 101,968 88,550
Held-to-maturity:    
Amortized cost 37,305 34,483
Gross unrealized, Gains 1,126 377
Gross unrealized, Losses 13 55
Securities held-to-maturity 38,418 34,805
Amortized cost, Total 136,808 121,918
Gross unrealized, Gain, Total 4,285 1,730
Gross unrealized, Losses, Total 707 293
Fair value, Total 140,386 123,355
Debt securities, available-for-sale, allowance for credit loss 15  
AOCI, transfers from AFS to HTM Securities, gross unrealized gains 29 32
AOCI, transfers from AFS to HTM Securities, gross unrealized losses 59 65
Agency RMBS    
Available-for-sale:    
Amortized cost 26,484 27,022
Gross unrealized, Gain 426 164
Gross unrealized, Loss 219 143
Available-for-sale 26,691 27,043
Held-to-maturity:    
Amortized cost 29,518 27,357
Gross unrealized, Gains 874 292
Gross unrealized, Losses 5 46
Securities held-to-maturity 30,387 27,603
U.S. Treasury    
Available-for-sale:    
Amortized cost 21,430 14,979
Gross unrealized, Gain 1,651 472
Gross unrealized, Loss 0 20
Available-for-sale 23,081 15,431
Held-to-maturity:    
Amortized cost 2,937 3,818
Gross unrealized, Gains 121 28
Gross unrealized, Losses 0 3
Securities held-to-maturity 3,058 3,843
Sovereign debt/sovereign guaranteed    
Available-for-sale:    
Amortized cost 12,791 12,548
Gross unrealized, Gain 128 109
Gross unrealized, Loss 9 11
Available-for-sale 12,910 12,646
Held-to-maturity:    
Amortized cost 919 756
Gross unrealized, Gains 37 31
Gross unrealized, Losses 0 0
Securities held-to-maturity 956 787
Agency commercial mortgage-backed securities (“MBS”)    
Available-for-sale:    
Amortized cost 9,315 9,231
Gross unrealized, Gain 510 203
Gross unrealized, Loss 20 17
Available-for-sale 9,805 9,417
Held-to-maturity:    
Amortized cost 1,868 1,326
Gross unrealized, Gains 84 21
Gross unrealized, Losses 0 3
Securities held-to-maturity 1,952 1,344
Foreign covered bonds    
Available-for-sale:    
Amortized cost 5,284 4,189
Gross unrealized, Gain 24 15
Gross unrealized, Loss 36 7
Available-for-sale 5,272 4,197
Held-to-maturity:    
Amortized cost 77 79
Gross unrealized, Gains 0 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 77 79
Collateralized loan obligations (“CLOs”)    
Available-for-sale:    
Amortized cost 4,341 4,078
Gross unrealized, Gain 1 1
Gross unrealized, Loss 244 16
Available-for-sale 4,098 4,063
Commercial paper/certificates of deposit (“CDs”)    
Available-for-sale:    
Amortized cost 2,813  
Gross unrealized, Gain 3  
Gross unrealized, Loss 2  
Available-for-sale 2,814  
Held-to-maturity:    
Amortized cost 651  
Gross unrealized, Gains 0  
Gross unrealized, Losses 0  
Securities held-to-maturity 651  
Supranational    
Available-for-sale:    
Amortized cost 4,316 3,697
Gross unrealized, Gain 38 18
Gross unrealized, Loss 6 6
Available-for-sale 4,348 3,709
Held-to-maturity:    
Amortized cost   27
Gross unrealized, Gains   0
Gross unrealized, Losses   0
Securities held-to-maturity   27
Foreign government agencies    
Available-for-sale:    
Amortized cost 2,736 2,638
Gross unrealized, Gain 31 7
Gross unrealized, Loss 3 2
Available-for-sale 2,764 2,643
Non-agency commercial MBS    
Available-for-sale:    
Amortized cost 2,501 2,134
Gross unrealized, Gain 35 46
Gross unrealized, Loss 63 2
Available-for-sale 2,473 2,178
Other ABS    
Available-for-sale:    
Amortized cost 2,257 2,141
Gross unrealized, Gain 6 7
Gross unrealized, Loss 43 5
Available-for-sale 2,220 2,143
U.S. government agencies    
Available-for-sale:    
Amortized cost 2,059 1,890
Gross unrealized, Gain 156 61
Gross unrealized, Loss 2 2
Available-for-sale 2,213 1,949
Held-to-maturity:    
Amortized cost 1,244 1,023
Gross unrealized, Gains 7 1
Gross unrealized, Losses 3 2
Securities held-to-maturity 1,248 1,022
Non-agency RMBS    
Available-for-sale:    
Amortized cost 1,404 1,038
Gross unrealized, Gain 114 202
Gross unrealized, Loss 43 7
Available-for-sale 1,475 1,233
Held-to-maturity:    
Amortized cost 75 80
Gross unrealized, Gains 3 4
Gross unrealized, Losses 5 1
Securities held-to-maturity 73 83
Non-agency RMBS | Grantor Trust    
Available-for-sale:    
Available-for-sale 535 640
State and political subdivisions    
Available-for-sale:    
Amortized cost 967 1,017
Gross unrealized, Gain 20 27
Gross unrealized, Loss 2 0
Available-for-sale 985 1,044
Held-to-maturity:    
Amortized cost 16 17
Gross unrealized, Gains 0 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 16 17
Corporate bonds    
Available-for-sale:    
Amortized cost 804 832
Gross unrealized, Gain 16 21
Gross unrealized, Loss 2 0
Available-for-sale 818 853
Other debt securities    
Available-for-sale:    
Amortized cost 1 1
Gross unrealized, Gain 0 0
Gross unrealized, Loss 0 0
Available-for-sale $ 1 $ 1