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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, 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 | $ (455) | $ (42)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 34,446 | 5,185
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (22) | (27)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 2,014 | 1,724
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (477) | (69)
Debt securities, available-for-sale, unrealized loss position | 36,460 | 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 | (266) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 12,798 | 603
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (266) | (13)
Debt securities, available-for-sale, unrealized loss position | 12,798 | 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 | (170) | (8)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 19,019 | 3,152
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (2) | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 75 | 82
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (172) | (10)
Debt securities, available-for-sale, unrealized loss position | 19,094 | 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 | (9) | (7)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 165 | 73
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (9) | (14)
Debt securities, available-for-sale, unrealized loss position | 165 | 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 | 190 |
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 | 69 | 149
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3) | (2)
Debt securities, available-for-sale, unrealized loss position | 259 | 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 | (1) | (13)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 275 | 972
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 | 911 | 714
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (6) | (20)
Debt securities, available-for-sale, unrealized loss position | 1,186 | 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 | (12) | (1)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,707 | 339
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (5) | (9)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 794 | 706
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (17) | (10)
Debt securities, available-for-sale, unrealized loss position | 2,501 | $ 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 | (4) |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 457 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (4) |
Debt securities, available-for-sale, unrealized loss position | $ 457 |

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