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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale:    
Amortized cost $ 99,338 $ 105,141
Gross unrealized, Gain 2,176 3,462
Gross unrealized, Loss 507 108
Available-for-sale 101,007 108,495
Held-to-maturity:    
Amortized cost 56,267 47,946
Gross unrealized, Gains 775 1,300
Gross unrealized, Losses 334 22
Securities held-to-maturity 56,708 49,224
Amortized cost, Total 155,605 153,087
Gross unrealized, Gain, Total 2,951 4,762
Gross unrealized, Losses, Total 841 130
Fair value, Total 157,715 157,719
Debt securities, available-for-sale, allowance for credit loss 10 11
AOCI, transfers from AFS to HTM Securities, gross unrealized gains 477 75
AOCI, transfers from AFS to HTM Securities, gross unrealized losses 80 44
U.S. Treasury    
Available-for-sale:    
Amortized cost 25,392 23,557
Gross unrealized, Gain 795 1,358
Gross unrealized, Loss 226 21
Available-for-sale 25,961 24,894
Held-to-maturity:    
Amortized cost 10,528 2,938
Gross unrealized, Gains 52 90
Gross unrealized, Losses 31 0
Securities held-to-maturity 10,549 3,028
Agency residential mortgage-backed securities (“RMBS”)    
Available-for-sale:    
Amortized cost 14,616 21,919
Gross unrealized, Gain 339 479
Gross unrealized, Loss 47 51
Available-for-sale 14,908 22,347
Held-to-maturity:    
Amortized cost 37,607 38,355
Gross unrealized, Gains 631 1,055
Gross unrealized, Losses 230 14
Securities held-to-maturity 38,008 39,396
Sovereign debt/sovereign guaranteed    
Available-for-sale:    
Amortized cost 12,999 12,202
Gross unrealized, Gain 112 190
Gross unrealized, Loss 42 1
Available-for-sale 13,069 12,391
Held-to-maturity:    
Amortized cost 969 1,050
Gross unrealized, Gains 23 42
Gross unrealized, Losses 3 0
Securities held-to-maturity 989 1,092
Agency commercial mortgage-backed securities (“MBS”)    
Available-for-sale:    
Amortized cost 8,139 8,605
Gross unrealized, Gain 430 625
Gross unrealized, Loss 25 2
Available-for-sale 8,544 9,228
Held-to-maturity:    
Amortized cost 4,170 2,659
Gross unrealized, Gains 64 105
Gross unrealized, Losses 29 2
Securities held-to-maturity 4,205 2,762
Supranational    
Available-for-sale:    
Amortized cost 7,931 7,086
Gross unrealized, Gain 34 75
Gross unrealized, Loss 26 1
Available-for-sale 7,939 7,160
Held-to-maturity:    
Amortized cost 54 55
Gross unrealized, Gains 0 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 54 55
Foreign covered bonds    
Available-for-sale:    
Amortized cost 6,917 6,658
Gross unrealized, Gain 38 68
Gross unrealized, Loss 9 1
Available-for-sale 6,946 6,725
Collateralized loan obligations (“CLOs”)    
Available-for-sale:    
Amortized cost 5,202 4,706
Gross unrealized, Gain 5 7
Gross unrealized, Loss 3 10
Available-for-sale 5,204 4,703
U.S. government agencies    
Available-for-sale:    
Amortized cost 2,541 3,680
Gross unrealized, Gain 115 174
Gross unrealized, Loss 13 1
Available-for-sale 2,643 3,853
Held-to-maturity:    
Amortized cost 2,879 2,816
Gross unrealized, Gains 1 4
Gross unrealized, Losses 41 6
Securities held-to-maturity 2,839 2,814
Non-agency commercial MBS    
Available-for-sale:    
Amortized cost 3,108 2,864
Gross unrealized, Gain 90 159
Gross unrealized, Loss 16 6
Available-for-sale 3,182 3,017
Foreign government agencies    
Available-for-sale:    
Amortized cost 2,670 4,086
Gross unrealized, Gain 16 49
Gross unrealized, Loss 7 0
Available-for-sale 2,679 4,135
State and political subdivisions    
Available-for-sale:    
Amortized cost 2,651 2,270
Gross unrealized, Gain 15 39
Gross unrealized, Loss 22 1
Available-for-sale 2,644 2,308
Held-to-maturity:    
Amortized cost 14 15
Gross unrealized, Gains 1 1
Gross unrealized, Losses 0 0
Securities held-to-maturity 15 16
Non-agency RMBS    
Available-for-sale:    
Amortized cost 2,469 2,178
Gross unrealized, Gain 144 157
Gross unrealized, Loss 15 9
Available-for-sale 2,598 2,326
Held-to-maturity:    
Amortized cost 46 58
Gross unrealized, Gains 3 3
Gross unrealized, Losses 0 0
Securities held-to-maturity 49 61
Non-agency RMBS | Grantor Trust    
Available-for-sale:    
Available-for-sale 387 487
Other asset-backed securities (“ABS”)    
Available-for-sale:    
Amortized cost 2,307 3,135
Gross unrealized, Gain 14 32
Gross unrealized, Loss 9 3
Available-for-sale 2,312 3,164
Corporate bonds    
Available-for-sale:    
Amortized cost 2,395 1,945
Gross unrealized, Gain 29 50
Gross unrealized, Loss 47 1
Available-for-sale 2,377 1,994
Commercial paper/certificates of deposit (“CDs”)    
Available-for-sale:    
Amortized cost   249
Gross unrealized, Gain   0
Gross unrealized, Loss   0
Available-for-sale   249
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