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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale:    
Amortized cost $ 87,435 $ 86,167
Gross unrealized, Gain 1,353 595
Gross unrealized, Loss 238 953
Available-for-sale 88,550 85,809
Held-to-maturity:    
Amortized cost 34,483 33,982
Gross unrealized, Gains 377 67
Gross unrealized, Losses 55 747
Securities held-to-maturity 34,805 33,302
Amortized cost, Total 121,918 120,149
Gross unrealized, Gain, Total 1,730 662
Gross unrealized, Losses, Total 293 1,700
Fair value, Total 123,355 119,111
AOCI, transfers from AFS to HTM Securities, gross unrealized gains 32 39
AOCI, transfers from AFS to HTM Securities, gross unrealized losses 65 87
Agency RMBS    
Available-for-sale:    
Amortized cost 27,022 25,594
Gross unrealized, Gain 164 83
Gross unrealized, Loss 143 369
Available-for-sale 27,043 25,308
Held-to-maturity:    
Amortized cost 27,357 25,507
Gross unrealized, Gains 292 32
Gross unrealized, Losses 46 632
Securities held-to-maturity 27,603 24,907
U.S. Treasury    
Available-for-sale:    
Amortized cost 14,979 20,190
Gross unrealized, Gain 472 96
Gross unrealized, Loss 20 210
Available-for-sale 15,431 20,076
Held-to-maturity:    
Amortized cost 3,818 4,727
Gross unrealized, Gains 28 3
Gross unrealized, Losses 3 77
Securities held-to-maturity 3,843 4,653
Sovereign debt/sovereign guaranteed    
Available-for-sale:    
Amortized cost 12,548 10,663
Gross unrealized, Gain 109 108
Gross unrealized, Loss 11 21
Available-for-sale 12,646 10,750
Held-to-maturity:    
Amortized cost 756 833
Gross unrealized, Gains 31 26
Gross unrealized, Losses 0 0
Securities held-to-maturity 787 859
Agency commercial mortgage-backed securities (“MBS”)    
Available-for-sale:    
Amortized cost 9,231 9,836
Gross unrealized, Gain 203 16
Gross unrealized, Loss 17 161
Available-for-sale 9,417 9,691
Held-to-maturity:    
Amortized cost 1,326 1,195
Gross unrealized, Gains 21 0
Gross unrealized, Losses 3 26
Securities held-to-maturity 1,344 1,169
Foreign covered bonds    
Available-for-sale:    
Amortized cost 4,189 2,890
Gross unrealized, Gain 15 7
Gross unrealized, Loss 7 19
Available-for-sale 4,197 2,878
Held-to-maturity:    
Amortized cost 79 80
Gross unrealized, Gains 0 1
Gross unrealized, Losses 0 0
Securities held-to-maturity 79 81
CLOs    
Available-for-sale:    
Amortized cost 4,078 3,410
Gross unrealized, Gain 1 0
Gross unrealized, Loss 16 46
Available-for-sale 4,063 3,364
Supranational    
Available-for-sale:    
Amortized cost 3,697 2,985
Gross unrealized, Gain 18 7
Gross unrealized, Loss 6 8
Available-for-sale 3,709 2,984
Held-to-maturity:    
Amortized cost 27 26
Gross unrealized, Gains 0 1
Gross unrealized, Losses 0 0
Securities held-to-maturity 27 27
Foreign government agencies    
Available-for-sale:    
Amortized cost 2,638 1,164
Gross unrealized, Gain 7 1
Gross unrealized, Loss 2 4
Available-for-sale 2,643 1,161
Non-agency commercial MBS    
Available-for-sale:    
Amortized cost 2,134 1,491
Gross unrealized, Gain 46 1
Gross unrealized, Loss 2 28
Available-for-sale 2,178 1,464
Other ABS    
Available-for-sale:    
Amortized cost 2,141 1,776
Gross unrealized, Gain 7 1
Gross unrealized, Loss 5 4
Available-for-sale 2,143 1,773
U.S. government agencies    
Available-for-sale:    
Amortized cost 1,890 1,676
Gross unrealized, Gain 61 5
Gross unrealized, Loss 2 24
Available-for-sale 1,949 1,657
Held-to-maturity:    
Amortized cost 1,023 1,497
Gross unrealized, Gains 1 0
Gross unrealized, Losses 2 10
Securities held-to-maturity 1,022 1,487
Non-agency RMBS    
Available-for-sale:    
Amortized cost 1,038 1,095
Gross unrealized, Gain 202 241
Gross unrealized, Loss 7 11
Available-for-sale 1,233 1,325
Held-to-maturity:    
Amortized cost 80 100
Gross unrealized, Gains 4 4
Gross unrealized, Losses 1 2
Securities held-to-maturity 83 102
Non-agency RMBS | Grantor Trust    
Available-for-sale:    
Available-for-sale 640 832
State and political subdivisions    
Available-for-sale:    
Amortized cost 1,017 2,251
Gross unrealized, Gain 27 18
Gross unrealized, Loss 0 22
Available-for-sale 1,044 2,247
Held-to-maturity:    
Amortized cost 17 17
Gross unrealized, Gains 0 0
Gross unrealized, Losses 0 0
Securities held-to-maturity 17 17
Corporate bonds    
Available-for-sale:    
Amortized cost 832 1,074
Gross unrealized, Gain 21 6
Gross unrealized, Loss 0 26
Available-for-sale 853 1,054
Other debt securities    
Available-for-sale:    
Amortized cost 1 72
Gross unrealized, Gain 0 5
Gross unrealized, Loss 0 0
Available-for-sale $ 1 $ 77