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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, 2021 | Dec. 31, 2020
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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 | $ (274) | $ (42)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 42,958 | 5,185
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (16) | (27)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 1,758 | 1,724
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (290) | (69)
Debt securities, available-for-sale, unrealized loss position | 44,716 | 6,909
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 | (146) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 17,168 | 603
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (146) | (13)
Debt securities, available-for-sale, unrealized loss position | 17,168 | 603
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, accumulated loss | (122) | (8)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 24,527 | 3,152
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (3) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 442 | 82
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (125) | (10)
Debt securities, available-for-sale, unrealized loss position | 24,969 | 3,234
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, accumulated loss |  | (7)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 119
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (5) | (7)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 155 | 73
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (5) | (14)
Debt securities, available-for-sale, unrealized loss position | 155 | 192
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, accumulated loss | (2) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 274 |
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 | 65 | 149
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3) | (2)
Debt securities, available-for-sale, unrealized loss position | 339 | 149
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, accumulated loss |  | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |  | 972
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (4) | (7)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 710 | 714
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4) | (20)
Debt securities, available-for-sale, unrealized loss position | 710 | 1,686
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (3) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 793 | 339
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (3) | (9)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 386 | 706
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (6) | (10)
Debt securities, available-for-sale, unrealized loss position | 1,179 | $ 1,045
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (1) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 196 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1) |
Debt securities, available-for-sale, unrealized loss position | $ 196 |

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