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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 | Dec. 31, 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, accumulated loss | $ (2,616) | $ (790)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 28,467 | 80,895
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (1,973) | (26)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 13,111 | 2,211
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4,589) | (816)
Debt securities, available-for-sale, unrealized loss position - fair value | 41,578 | 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, accumulated loss | (601) | (370)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 5,868 | 32,600
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (235) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,208 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (836) | (370)
Debt securities, available-for-sale, unrealized loss position - fair value | 8,076 | 32,600
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (1,744) | (369)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 19,036 | 41,521
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (1,560) | (20)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 8,971 | 1,489
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3,304) | (389)
Debt securities, available-for-sale, unrealized loss position - fair value | 28,007 | 43,010
Residential mortgage-backed Securities | 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, accumulated loss | (6) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 112 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (2) |
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 | (8) |
Debt securities, available-for-sale, unrealized loss position - fair value | 129 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (125) | (5)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,283 | 451
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (45) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 372 | 60
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (170) | (6)
Debt securities, available-for-sale, unrealized loss position - fair value | 1,655 | 511
Commercial Mortgage Backed Securities | 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, accumulated loss | (44) | (4)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 750 | 1,453
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (18) | (3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 394 | 474
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (62) | (7)
Debt securities, available-for-sale, unrealized loss position - fair value | 1,144 | 1,927
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated 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, accumulated loss | (1) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 5 | 188
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1) | (31)
Debt securities, available-for-sale, unrealized loss position - fair value | 5 | 3,653
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (96) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,418 | 1,405
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (112) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,144 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (208) | (13)
Debt securities, available-for-sale, unrealized loss position - fair value | $ 2,562 | $ 1,405

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