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Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | $ (72) | $ (2,616)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 4,087 | 28,467
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (4,327) | (1,973)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 35,077 | 13,111
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4,399) | (4,589)
Debt securities, available-for-sale, unrealized loss position, fair value | 39,164 | 41,578
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (9) | (601)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 898 | 5,868
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (751) | (235)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 5,983 | 2,208
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (760) | (836)
Debt securities, available-for-sale, unrealized loss position, fair value | 6,881 | 8,076
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (51) | (1,744)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,309 | 19,036
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (3,167) | (1,560)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 24,700 | 8,971
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3,218) | (3,304)
Debt securities, available-for-sale, unrealized loss position, fair value | 27,009 | 28,007
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (1) | (6)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 46 | 112
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (6) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 67 | 17
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (7) | (8)
Debt securities, available-for-sale, unrealized loss position, fair value | 113 | 129
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (2) | (125)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 89 | 1,283
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (165) | (45)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,485 | 372
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (167) | (170)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,574 | 1,655
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss |  | (44)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 750
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (57) | (18)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 808 | 394
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (57) | (62)
Debt securities, available-for-sale, unrealized loss position, fair value | 808 | 1,144
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (3) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 502 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (1) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 12 | 5
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4) | (1)
Debt securities, available-for-sale, unrealized loss position, fair value | 514 | 5
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (6) | (96)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 243 | 1,418
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (180) | (112)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,022 | 1,144
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (186) | (208)
Debt securities, available-for-sale, unrealized loss position, fair value | $ 2,265 | $ 2,562

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