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Accounting Policies - Impact of CECL Standard Adoption (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2020 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | $ 2,742 | $ 2,629 | $ 2,611 |  | $ 2,589
Allowance for unfunded loan commitments and letters of credit | 318 | 285 |  |  |
Other | 0 |  |  |  |
Total allowance | 3,060 |  |  |  |
Retained earnings | 42,215 | 38,919 |  |  |
Income taxes from continuing operations | 901 | 928 | (185) |  |
Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  |  |  | $ 3,205 |
Allowance for unfunded loan commitments and letters of credit |  |  |  | 497 |
Other |  |  |  | 19 |
Total allowance |  |  |  | 3,721 |
Retained earnings |  |  |  | 41,544 |
Accounting Standards Update 2016-13 | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total allowance |  |  |  | 3,700 |
Accounting Standards Update 2016-13 | Transition Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 463 |  |  |  |
Allowance for unfunded loan commitments and letters of credit | 179 |  |  |  |
Other | 19 |  |  |  |
Total allowance | 661 |  |  |  |
Retained earnings | (671) |  |  |  |
Fair Value - Assets | 200 |  |  |  |
Income taxes from continuing operations | 200 |  |  |  |
Total commercial lending |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 1,812 | 1,663 | 1,582 |  | 1,534
Total commercial lending | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  |  |  | 1,508 |
Total commercial lending | Accounting Standards Update 2016-13 | Transition Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | (304) |  |  |  |
Total consumer lending |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | 930 | $ 966 | $ 1,029 |  | $ 1,055
Total consumer lending | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses |  |  |  | $ 1,697 |
Total consumer lending | Accounting Standards Update 2016-13 | Transition Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loan and lease losses | $ 767 |  |  |  |

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