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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 123,019 | $ 84,172
Securities available for sale debt securities, unrealized gains | 2,338 | 3,302
Securities available for sale debt securities, unrealized losses | (299) | (116)
Investment securities – available for sale | 125,058 | 87,358
Held to maturity securities, amortized cost | 1,485 | 1,441
Held-to-maturity securities, unrealized gains | 120 | 167
Held-to-maturity securities, unrealized losses | (7) | (3)
Held-to-maturity securities, fair value | 1,598 | 1,605
Debt securities, available-for-sale, accrued interest | 311 | 238
Debt securities, available-for-sale, allowance for credit loss | $ 105 | $ 79
Credit Concentration Risk | Fitch, AAA or AA Rating | Held-to-maturity Securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 84.00% | 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 | $ 38,564 | $ 19,821
Securities available for sale debt securities, unrealized gains | 593 | 903
Securities available for sale debt securities, unrealized losses | (146) | (13)
Investment securities – available for sale | 39,011 | 20,711
Held to maturity securities, amortized cost | 804 | 795
Held-to-maturity securities, unrealized gains | 87 | 125
Held-to-maturity securities, fair value | 891 | 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 | 66,393 | 47,355
Securities available for sale debt securities, unrealized gains | 1,046 | 1,566
Securities available for sale debt securities, unrealized losses | (125) | (10)
Investment securities – available for sale | 67,314 | 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 | 1,081 | 1,272
Securities available for sale debt securities, unrealized gains | 247 | 243
Securities available for sale debt securities, unrealized losses | (5) | (14)
Investment securities – available for sale | 1,323 | 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 | 2,263 | 2,571
Securities available for sale debt securities, unrealized gains | 71 | 119
Securities available for sale debt securities, unrealized losses | (3) | (2)
Investment securities – available for sale | 2,331 | 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 | 4,033 | 3,678
Securities available for sale debt securities, unrealized gains | 59 | 78
Securities available for sale debt securities, unrealized losses | (13) | (67)
Investment securities – available for sale | 4,079 | 3,689
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,625 | 5,060
Securities available for sale debt securities, unrealized gains | 78 | 100
Securities available for sale debt securities, unrealized losses | (6) | (10)
Investment securities – available for sale | 5,697 | 5,150
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,060 | 4,415
Securities available for sale debt securities, unrealized gains | 244 | 293
Securities available for sale debt securities, unrealized losses | (1) |
Investment securities – available for sale | 5,303 | 4,708
Held to maturity securities, amortized cost | 681 | 646
Held-to-maturity securities, unrealized gains | 33 | 42
Held-to-maturity securities, unrealized losses | (7) | (3)
Held-to-maturity securities, fair value | $ 707 | $ 685

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