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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, 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 | $ (2,814) | $ (790)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 44,466 | 80,895
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (399) | (26)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 3,705 | 2,211
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3,213) | (816)
Debt securities, available-for-sale, unrealized loss position, fair value | 48,171 | 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 | (729) | (370)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 10,450 | 32,600
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (120) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,239 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (849) | (370)
Debt securities, available-for-sale, unrealized loss position, fair value | 11,689 | 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 | (1,811) | (369)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 28,806 | 41,521
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (263) | (20)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,135 | 1,489
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (2,074) | (389)
Debt securities, available-for-sale, unrealized loss position, fair value | 30,941 | 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 | (2) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 101 |
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 | 19 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4) |
Debt securities, available-for-sale, unrealized loss position, fair value | 120 |
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 | (88) | (5)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,720 | 451
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (6) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 136 | 60
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (94) | (6)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,856 | 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 | (31) | (4)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,078 | 1,453
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (3) | (3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 140 | 474
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (34) | (7)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,218 | 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 |  | (29)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 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 |  | (31)
Debt securities, available-for-sale, unrealized loss position, fair value |  | 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 | (153) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,311 | 1,405
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (5) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 36 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (158) | (13)
Debt securities, available-for-sale, unrealized loss position, fair value | $ 2,347 | $ 1,405

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