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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | $ 48,568 | $ 130,798
Securities available for sale debt securities, unrealized gains | 225 | 1,566
Securities available for sale debt securities, unrealized losses | (4,634) | (828)
Securities available for sale debt securities, fair value | 44,159 | 131,536
Held-to-maturity, Amortized costs | 95,175 | 1,426
Held-to-maturity securities, unrealized gains | 115 | 103
Held-to-maturity securities, unrealized losses | (5,011) | (7)
Held-to-maturity securities, fair value | 90,279 | 1,522
Accrued Interest, held-to-maturity | 282 | 5
Accrued interest, available-for-sale | $ 144 | $ 322
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other | Other
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other | Other
Debt securities, available-for-sale, allowance for credit loss | $ 142 | $ 130
Debt securities, held-to-maturity, allowance for credit loss | 7 | $ 3
Unrealized losses related to transfers | $ 5,100 |
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 | 97.00% | 96.00%
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | $ 9,196 | $ 46,210
Securities available for sale debt securities, unrealized gains | 10 | 324
Securities available for sale debt securities, unrealized losses | (836) | (370)
Securities available for sale debt securities, fair value | 8,370 | 46,164
Held-to-maturity, Amortized costs | 36,571 | 814
Held-to-maturity securities, unrealized gains | 6 | 76
Held-to-maturity securities, unrealized losses | (1,617) |
Held-to-maturity securities, fair value | 34,960 | 890
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 32,114 | 67,326
Securities available for sale debt securities, unrealized gains | 13 | 695
Securities available for sale debt securities, unrealized losses | (3,304) | (389)
Securities available for sale debt securities, fair value | 28,823 | 67,632
Held-to-maturity, Amortized costs | 45,271 |
Held-to-maturity securities, unrealized gains | 74 |
Held-to-maturity securities, unrealized losses | (3,095) |
Held-to-maturity securities, fair value | 42,250 |
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 697 | 927
Securities available for sale debt securities, unrealized gains | 131 | 231
Securities available for sale debt securities, unrealized losses | (9) |
Securities available for sale debt securities, fair value | 819 | 1,158
Held-to-maturity, Amortized costs | 276 |
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (21) |
Held-to-maturity securities, fair value | 255 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 1,845 | 1,740
Securities available for sale debt securities, unrealized gains |  | 39
Securities available for sale debt securities, unrealized losses | (170) | (6)
Securities available for sale debt securities, fair value | 1,675 | 1,773
Held-to-maturity, Amortized costs | 848 |
Held-to-maturity securities, unrealized gains | 4 |
Held-to-maturity securities, unrealized losses | (26) |
Held-to-maturity securities, fair value | 826 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 1,325 | 3,423
Securities available for sale debt securities, unrealized gains |  | 31
Securities available for sale debt securities, unrealized losses | (69) | (18)
Securities available for sale debt securities, fair value | 1,256 | 3,436
Held-to-maturity, Amortized costs | 1,667 |
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (40) |
Held-to-maturity securities, fair value | 1,627 |
Asset-backed Securities |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 103 | 6,380
Securities available for sale debt securities, unrealized gains | 27 | 60
Securities available for sale debt securities, unrealized losses | (1) | (31)
Securities available for sale debt securities, fair value | 129 | 6,409
Held-to-maturity, Amortized costs | 7,188 |
Held-to-maturity securities, unrealized gains | 6 |
Held-to-maturity securities, unrealized losses | (140) |
Held-to-maturity securities, fair value | 7,054 |
Other debt |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Available-for-sale Securities, Amortized Cost | 3,288 | 4,792
Securities available for sale debt securities, unrealized gains | 44 | 186
Securities available for sale debt securities, unrealized losses | (245) | (14)
Securities available for sale debt securities, fair value | 3,087 | 4,964
Held-to-maturity, Amortized costs | 3,354 | 612
Held-to-maturity securities, unrealized gains | 25 | 27
Held-to-maturity securities, unrealized losses | (72) | (7)
Held-to-maturity securities, fair value | $ 3,307 | $ 632

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