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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 | Sep. 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 | $ (126) | $ (2,616)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 4,653 | 28,467
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (5,412) | (1,973)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 34,079 | 13,111
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (5,538) | (4,589)
Debt securities, available-for-sale, unrealized loss position, fair value | 38,732 | 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 | (3) | (601)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 374 | 5,868
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (778) | (235)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 6,013 | 2,208
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (781) | (836)
Debt securities, available-for-sale, unrealized loss position, fair value | 6,387 | 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 | (107) | (1,744)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 3,294 | 19,036
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (4,171) | (1,560)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 23,547 | 8,971
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4,278) | (3,304)
Debt securities, available-for-sale, unrealized loss position, fair value | 26,841 | 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 | 51 | 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 | 71 | 17
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (7) | (8)
Debt securities, available-for-sale, unrealized loss position, fair value | 122 | 129
Commercial mortgage servicing rights | 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 | (1) | (125)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 42 | 1,283
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (193) | (45)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,493 | 372
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (194) | (170)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,535 | 1,655
Commercial mortgage servicing rights | 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 | (55) | (18)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 793 | 394
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (55) | (62)
Debt securities, available-for-sale, unrealized loss position, fair value | 793 | 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 | (6) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 687 |
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 | 10 | 5
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (7) | (1)
Debt securities, available-for-sale, unrealized loss position, fair value | 697 | 5
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (8) | (96)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 205 | 1,418
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (208) | (112)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,152 | 1,144
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (216) | (208)
Debt securities, available-for-sale, unrealized loss position, fair value | $ 2,357 | $ 2,562

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