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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale:    
Amortized cost $ 105,684 $ 87,435
Gross unrealized, Gain 3,694 1,353
Gross unrealized, Loss 135 238
Available-for-sale 109,243 88,550
Held-to-maturity:    
Amortized cost 46,096 34,483
Gross unrealized, Gains 1,377 377
Gross unrealized, Losses 15 55
Securities held-to-maturity 47,458 34,805
Amortized cost, Total 151,780 121,918
Gross unrealized, Gain, Total 5,071 1,730
Gross unrealized, Losses, Total 150 293
Fair value, Total 156,701 123,355
Debt securities, available-for-sale, allowance for credit loss 12  
AOCI, transfers from AFS to HTM Securities, gross unrealized gains 25 32
AOCI, transfers from AFS to HTM Securities, gross unrealized losses 49 65
Agency RMBS    
Available-for-sale:    
Amortized cost 24,262 27,022
Gross unrealized, Gain 526 164
Gross unrealized, Loss 55 143
Available-for-sale 24,733 27,043
Held-to-maturity:    
Amortized cost 37,086 27,357
Gross unrealized, Gains 1,117 292
Gross unrealized, Losses 10 46
Securities held-to-maturity 38,193 27,603
U.S. Treasury    
Available-for-sale:    
Amortized cost 23,166 14,979
Gross unrealized, Gain 1,568 472
Gross unrealized, Loss 1 20
Available-for-sale 24,733 15,431
Held-to-maturity:    
Amortized cost 3,288 3,818
Gross unrealized, Gains 103 28
Gross unrealized, Losses 0 3
Securities held-to-maturity 3,391 3,843
Sovereign debt/sovereign guaranteed    
Available-for-sale:    
Amortized cost 13,925 12,548
Gross unrealized, Gain 169 109
Gross unrealized, Loss 1 11
Available-for-sale 14,093 12,646
Held-to-maturity:    
Amortized cost 983 756
Gross unrealized, Gains 41 31
Gross unrealized, Losses 0 0
Securities held-to-maturity 1,024 787
Agency commercial mortgage-backed securities (“MBS”)    
Available-for-sale:    
Amortized cost 9,299 9,231
Gross unrealized, Gain 646 203
Gross unrealized, Loss 3 17
Available-for-sale 9,942 9,417
Held-to-maturity:    
Amortized cost 2,041 1,326
Gross unrealized, Gains 107 21
Gross unrealized, Losses 0 3
Securities held-to-maturity 2,148 1,344
Foreign covered bonds    
Available-for-sale:    
Amortized cost 5,777 4,189
Gross unrealized, Gain 64 15
Gross unrealized, Loss 0 7
Available-for-sale 5,841 4,197
Held-to-maturity:    
Amortized cost   79
Gross unrealized, Gains   0
Gross unrealized, Losses   0
Securities held-to-maturity   79
Supranational    
Available-for-sale:    
Amortized cost 7,069 3,697
Gross unrealized, Gain 68 18
Gross unrealized, Loss 1 6
Available-for-sale 7,136 3,709
Held-to-maturity:    
Amortized cost 52 27
Gross unrealized, Gains 1 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 53 27
Collateralized loan obligations (“CLOs”)    
Available-for-sale:    
Amortized cost 4,696 4,078
Gross unrealized, Gain 5 1
Gross unrealized, Loss 44 16
Available-for-sale 4,657 4,063
Foreign government agencies    
Available-for-sale:    
Amortized cost 3,924 2,638
Gross unrealized, Gain 46 7
Gross unrealized, Loss 0 2
Available-for-sale 3,970 2,643
U.S. government agencies    
Available-for-sale:    
Amortized cost 3,300 1,890
Gross unrealized, Gain 180 61
Gross unrealized, Loss 2 2
Available-for-sale 3,478 1,949
Held-to-maturity:    
Amortized cost 2,266 1,023
Gross unrealized, Gains 5 1
Gross unrealized, Losses 4 2
Securities held-to-maturity 2,267 1,022
Other ABS    
Available-for-sale:    
Amortized cost 2,903 2,141
Gross unrealized, Gain 31 7
Gross unrealized, Loss 4 5
Available-for-sale 2,930 2,143
Non-agency commercial MBS    
Available-for-sale:    
Amortized cost 2,565 2,134
Gross unrealized, Gain 156 46
Gross unrealized, Loss 10 2
Available-for-sale 2,711 2,178
Commercial paper/certificates of deposit (“CDs”)    
Available-for-sale:    
Amortized cost 355  
Gross unrealized, Gain 2  
Gross unrealized, Loss 0  
Available-for-sale 357  
Held-to-maturity:    
Amortized cost 295  
Gross unrealized, Gains 0  
Gross unrealized, Losses 0  
Securities held-to-maturity 295  
Non-agency RMBS    
Available-for-sale:    
Amortized cost 1,793 1,038
Gross unrealized, Gain 157 202
Gross unrealized, Loss 9 7
Available-for-sale 1,941 1,233
Held-to-maturity:    
Amortized cost 70 80
Gross unrealized, Gains 3 4
Gross unrealized, Losses 1 1
Securities held-to-maturity 72 83
Non-agency RMBS | Grantor Trust    
Available-for-sale:    
Available-for-sale 512 640
State and political subdivisions    
Available-for-sale:    
Amortized cost 1,661 1,017
Gross unrealized, Gain 33 27
Gross unrealized, Loss 4 0
Available-for-sale 1,690 1,044
Held-to-maturity:    
Amortized cost 15 17
Gross unrealized, Gains 0 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 15 17
Corporate bonds    
Available-for-sale:    
Amortized cost 988 832
Gross unrealized, Gain 43 21
Gross unrealized, Loss 1 0
Available-for-sale 1,030 853
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