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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 94,806 | $ 84,172
Securities available for sale debt securities, unrealized gains | 2,480 | 3,302
Securities available for sale debt securities, unrealized losses | (487) | (116)
Investment securities – available for sale | 96,799 | 87,358
Held to maturity securities, amortized cost | 1,456 | 1,441
Held-to-maturity securities, unrealized gains | 110 | 167
Held-to-maturity securities, unrealized losses | (7) | (3)
Held-to-maturity securities, fair value | 1,559 | 1,605
Debt securities, available-for-sale, accrued interest | 244 | 238
Debt securities, available-for-sale, allowance for credit loss | $ 105 | $ 79
Credit Concentration Risk | Fitch, AAA or AA Rating |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 85.00% | 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 | $ 25,670 | $ 19,821
Securities available for sale debt securities, unrealized gains | 546 | 903
Securities available for sale debt securities, unrealized losses | (266) | (13)
Investment securities – available for sale | 25,950 | 20,711
Held to maturity securities, amortized cost | 800 | 795
Held-to-maturity securities, unrealized gains | 74 | 125
Held-to-maturity securities, fair value | 874 | 920
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 50,499 | 47,355
Securities available for sale debt securities, unrealized gains | 1,227 | 1,566
Securities available for sale debt securities, unrealized losses | (172) | (10)
Investment securities – available for sale | 51,554 | 48,911
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 1,181 | 1,272
Securities available for sale debt securities, unrealized gains | 252 | 243
Securities available for sale debt securities, unrealized losses | (9) | (14)
Investment securities – available for sale | 1,424 | 1,501
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 2,219 | 2,571
Securities available for sale debt securities, unrealized gains | 68 | 119
Securities available for sale debt securities, unrealized losses | (3) | (2)
Investment securities – available for sale | 2,284 | 2,688
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 4,191 | 3,678
Securities available for sale debt securities, unrealized gains | 60 | 78
Securities available for sale debt securities, unrealized losses | (15) | (67)
Investment securities – available for sale | 4,236 | 3,689
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,969 | 5,060
Securities available for sale debt securities, unrealized gains | 89 | 100
Securities available for sale debt securities, unrealized losses | (17) | (10)
Investment securities – available for sale | 6,041 | 5,150
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,077 | 4,415
Securities available for sale debt securities, unrealized gains | 238 | 293
Securities available for sale debt securities, unrealized losses | (5) |
Investment securities – available for sale | 5,310 | 4,708
Held to maturity securities, amortized cost | 656 | 646
Held-to-maturity securities, unrealized gains | 36 | 42
Held-to-maturity securities, unrealized losses | (7) | (3)
Held-to-maturity securities, fair value | $ 685 | $ 685

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