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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 84,172 | $ 67,790
Securities available for sale debt securities, unrealized gains | 3,302 | 1,471
Securities available for sale debt securities, unrealized losses | (116) | (98)
Securities available for sale debt securities, fair value | 87,358 | 69,163
Held-to-maturity, debt securities | 1,441 | 17,661
Held-to-maturity securities, unrealized gains | 167 | 423
Held-to-maturity securities, unrealized losses | (3) | (40)
Held-to-maturity securities, fair value | 1,605 | 18,044
Accrued interest, available-for-sale | 238 |
Accrued Interest, held-to-maturity | 5 |
Debt securities, available-for-sale, allowance for credit loss | 79 |
Debt securities, held-to-maturity, allowance for credit loss | $ 3 |
Fitch, AAA OR AA Rating | Credit Concentration Risk |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 85.00% |
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 19,821 | 16,150
Securities available for sale debt securities, unrealized gains | 903 | 382
Securities available for sale debt securities, unrealized losses | (13) | (16)
Securities available for sale debt securities, fair value | 20,711 | 16,516
Held-to-maturity, debt securities | 795 | 776
Held-to-maturity securities, unrealized gains | 125 | 56
Held-to-maturity securities, fair value | 920 | 832
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 47,355 | 35,847
Securities available for sale debt securities, unrealized gains | 1,566 | 517
Securities available for sale debt securities, unrealized losses | (10) | (43)
Securities available for sale debt securities, fair value | 48,911 | 36,321
Held-to-maturity, debt securities |  | 14,419
Held-to-maturity securities, unrealized gains |  | 270
Held-to-maturity securities, unrealized losses |  | (26)
Held-to-maturity securities, fair value |  | 14,663
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 1,272 | 1,515
Securities available for sale debt securities, unrealized gains | 243 | 302
Securities available for sale debt securities, unrealized losses | (14) | (3)
Securities available for sale debt securities, fair value | 1,501 | 1,814
Held-to-maturity, debt securities |  | 133
Held-to-maturity securities, unrealized gains |  | 7
Held-to-maturity securities, fair value |  | 140
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 2,571 | 3,094
Securities available for sale debt securities, unrealized gains | 119 | 42
Securities available for sale debt securities, unrealized losses | (2) | (18)
Securities available for sale debt securities, fair value | 2,688 | 3,118
Held-to-maturity, debt securities |  | 59
Held-to-maturity securities, unrealized gains |  | 1
Held-to-maturity securities, fair value |  | 60
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 3,678 | 3,352
Securities available for sale debt securities, unrealized gains | 78 | 29
Securities available for sale debt securities, unrealized losses | (67) | (9)
Securities available for sale debt securities, fair value | 3,689 | 3,372
Held-to-maturity, debt securities |  | 430
Held-to-maturity securities, unrealized gains |  | 4
Held-to-maturity securities, fair value |  | 434
Asset-backed Securities |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,060 | 5,044
Securities available for sale debt securities, unrealized gains | 100 | 78
Securities available for sale debt securities, unrealized losses | (10) | (8)
Securities available for sale debt securities, fair value | 5,150 | 5,114
Held-to-maturity, debt securities |  | 52
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, fair value |  | 52
Other debt |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 4,415 | 2,788
Securities available for sale debt securities, unrealized gains | 293 | 121
Securities available for sale debt securities, unrealized losses |  | (1)
Securities available for sale debt securities, fair value | 4,708 | 2,908
Held-to-maturity, debt securities | 646 | 1,792
Held-to-maturity securities, unrealized gains | 42 | 85
Held-to-maturity securities, unrealized losses | (3) | (14)
Held-to-maturity securities, fair value | $ 685 | $ 1,863

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