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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 | Mar. 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, unrealized loss | $ (4,289) | $ (790)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 88,425 | 80,895
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (453) | (26)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 6,990 | 2,211
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4,742) | (816)
Debt securities, available-for-sale, unrealized loss position, fair value | 95,415 | 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 | (1,433) | (370)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 26,147 | 32,600
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (274) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 3,788 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1,707) | (370)
Debt securities, available-for-sale, unrealized loss position, fair value | 29,935 | 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 | (2,551) | (369)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 50,802 | 41,521
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (132) | (20)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,940 | 1,489
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (2,683) | (389)
Debt securities, available-for-sale, unrealized loss position, fair value | 52,742 | 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 | (9) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 334 |
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 | 20 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (10) |
Debt securities, available-for-sale, unrealized loss position, fair value | 354 |
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 | (42) | (5)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,481 | 451
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (4) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 120 | 60
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (46) | (6)
Debt securities, available-for-sale, unrealized loss position, fair value | 1,601 | 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 | 2,246 | 1,453
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (6) | (3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 470 | 474
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (37) | (7)
Debt securities, available-for-sale, unrealized loss position, fair value | 2,716 | 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 | (123) | (29)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 5,091 | 3,465
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (25) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 517 | 188
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (148) | (31)
Debt securities, available-for-sale, unrealized loss position, fair value | 5,608 | 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 | (100) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,324 | 1,405
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, unrealized loss | (11) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 135 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (111) | (13)
Debt securities, available-for-sale, unrealized loss position, fair value | $ 2,459 | $ 1,405

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