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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, 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, accumulated loss | $ (8) | $ (2,616)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,108 | 28,467
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (3,792) | (1,973)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 34,766 | 13,111
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3,800) | (4,589)
Debt securities, available-for-sale, unrealized loss position - fair value | 35,874 | 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, accumulated loss |  | (601)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 5,868
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (666) | (235)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 6,035 | 2,208
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (666) | (836)
Debt securities, available-for-sale, unrealized loss position - fair value | 6,035 | 8,076
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 | (4) | (1,744)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,015 | 19,036
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (2,805) | (1,560)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 24,306 | 8,971
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (2,809) | (3,304)
Debt securities, available-for-sale, unrealized loss position - fair value | 25,321 | 28,007
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 | (1) | (6)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 15 | 112
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (4) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 84 | 17
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (5) | (8)
Debt securities, available-for-sale, unrealized loss position - fair value | 99 | 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)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 1,283
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (135) | (45)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,495 | 372
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (135) | (170)
Debt securities, available-for-sale, unrealized loss position - fair value | 1,495 | 1,655
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)
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, accumulated loss | (45) | (18)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 731 | 394
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (45) | (62)
Debt securities, available-for-sale, unrealized loss position - fair value | 731 | 1,144
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (1) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 9 | 5
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1) | (1)
Debt securities, available-for-sale, unrealized loss position - fair value | 9 | 5
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (3) | (96)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 78 | 1,418
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (136) | (112)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,106 | 1,144
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (139) | (208)
Debt securities, available-for-sale, unrealized loss position - fair value | $ 2,184 | $ 2,562

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