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Accounting Policies - Impact of CECL Standard Adoption (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  | $ 5,361 | $ 2,742 | $ 2,629 | $ 2,611
Unfunded lending related commitments |  | 584 | 318 |  |
Other |  |  |  |  |
Total allowance for credit losses |  |  | 3,060 |  |
Retained earnings |  | 46,848 | 42,215 |  |
Income taxes from continuing operations |  | 426 | 901 | 928 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | $ 463 |  | 463 |  |
Unfunded lending related commitments | 179 |  | 179 |  |
Other | 19 |  |  |  |
Total allowance for credit losses | 661 |  |  |  |
Retained earnings | (671) |  |  |  |
Fair value - assets | 200 |  |  |  |
Income taxes from continuing operations | 200 |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 3,205 |  | 3,205 |  |
Unfunded lending related commitments | 497 |  | 497 |  |
Other | 19 |  |  |  |
Total allowance for credit losses | 3,721 |  |  |  |
Retained earnings | 41,544 |  |  |  |
Total commercial lending |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  | 3,337 | 1,812 | 1,663 | 1,582
Unfunded lending related commitments |  | 485 | 316 |  |
Total commercial lending | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | (304) |  | (304) |  |
Unfunded lending related commitments |  |  | 53 |  |
Total commercial lending | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 1,508 |  | 1,508 |  |
Unfunded lending related commitments |  |  | 369 |  |
Total consumer lending |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  | 2,024 | 930 | $ 966 | $ 1,029
Unfunded lending related commitments |  | $ 99 | 2 |  |
Total consumer lending | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 767 |  | 767 |  |
Unfunded lending related commitments |  |  | 126 |  |
Total consumer lending | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | $ 1,697 |  | 1,697 |  |
Unfunded lending related commitments |  |  | $ 128 |  |

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