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v3.22.1

Investment Securities (Summary) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 116,591 | $ 130,798
Securities available for sale debt securities, unrealized gains | 492 | 1,566
Securities available for sale debt securities, unrealized losses | (4,770) | (828)
Securities available for sale debt securities, fair value | 112,313 | 131,536
Held to maturity securities, amortized cost | 20,098 | 1,426
Held-to-maturity securities, unrealized gains | 36 | 103
Held-to-maturity securities, unrealized losses | (19) | (7)
Held-to-maturity securities, fair value | 20,115 | 1,522
Accrued interest | 312 | 327
Debt securities, available-for-sale, allowance for credit loss | 131 | $ 130
Net unrealized losses, related to securities transferred to held to maturity | $ 1,300 |
Fitch, AAA OR AA Rating | Credit Concentration Risk | Held-to-maturity Securities |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 99.00% | 86.00%
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 36,872 | $ 46,210
Securities available for sale debt securities, unrealized gains | 56 | 324
Securities available for sale debt securities, unrealized losses | (1,707) | (370)
Securities available for sale debt securities, fair value | 35,221 | 46,164
Held to maturity securities, amortized cost | 9,991 | 814
Held-to-maturity securities, unrealized gains | 25 | 76
Held-to-maturity securities, unrealized losses | (5) |
Held-to-maturity securities, fair value | 10,011 | 890
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 | 61,407 | 67,326
Securities available for sale debt securities, unrealized gains | 91 | 695
Securities available for sale debt securities, unrealized losses | (2,683) | (389)
Securities available for sale debt securities, fair value | 58,815 | 67,632
Held to maturity securities, amortized cost | 9,548 |
Held-to-maturity securities, fair value | 9,548 |
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 | 1,132 | 927
Securities available for sale debt securities, unrealized gains | 210 | 231
Securities available for sale debt securities, unrealized losses | (10) |
Securities available for sale debt securities, fair value | 1,332 | 1,158
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 | 2,152 | 1,740
Securities available for sale debt securities, unrealized gains | 4 | 39
Securities available for sale debt securities, unrealized losses | (46) | (6)
Securities available for sale debt securities, fair value | 2,110 | 1,773
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 | 3,504 | 3,423
Securities available for sale debt securities, unrealized gains | 2 | 31
Securities available for sale debt securities, unrealized losses | (51) | (18)
Securities available for sale debt securities, fair value | 3,455 | 3,436
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 6,407 | 6,380
Securities available for sale debt securities, unrealized gains | 46 | 60
Securities available for sale debt securities, unrealized losses | (148) | (31)
Securities available for sale debt securities, fair value | 6,305 | 6,409
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 5,117 | 4,792
Securities available for sale debt securities, unrealized gains | 83 | 186
Securities available for sale debt securities, unrealized losses | (125) | (14)
Securities available for sale debt securities, fair value | 5,075 | 4,964
Held to maturity securities, amortized cost | 559 | 612
Held-to-maturity securities, unrealized gains | 11 | 27
Held-to-maturity securities, unrealized losses | (14) | (7)
Held-to-maturity securities, fair value | $ 556 | $ 632

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