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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, 2022 | Dec. 31, 2021
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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 | $ (4,098) | $ (790)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 38,715 | 80,895
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (872) | (26)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 4,717 | 2,211
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4,970) | (816)
Debt securities, available-for-sale, unrealized loss position, fair value | 43,432 | 83,106
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 | (817) | (370)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 9,462 | 32,600
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (67) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 404 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (884) | (370)
Debt securities, available-for-sale, unrealized loss position, fair value | 9,866 | 32,600
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 | (2,874) | (369)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 24,373 | 41,521
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (735) | (20)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 3,602 | 1,489
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3,609) | (389)
Debt securities, available-for-sale, unrealized loss position, fair value | 27,975 | 43,010
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 | (3) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 71 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (1) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 17 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4) |
Debt securities, available-for-sale, unrealized loss position, fair value | 88 |
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 | (166) | (5)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,588 | 451
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (10) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 144 | 60
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (176) | (6)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,732 | 511
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 | (42) | (4)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 945 | 1,453
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (7) | (3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 236 | 474
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (49) | (7)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,181 | 1,927
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (1) | (29)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 10 | 3,465
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss |  | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value |  | 188
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1) | (31)
Debt securities, available-for-sale, unrealized loss position, fair value | 10 | 3,653
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, unrealized loss | (195) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,266 | 1,405
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (52) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 314 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (247) | (13)
Debt securities, available-for-sale, unrealized loss position, fair value | $ 2,580 | $ 1,405

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