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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Consolidated Balance Sheets with Change in Accounting Principle |
| December 31, 2021 |  | December 31, 2020
(in millions) | Change Impact |  | Previously Reported | Change Impact | Recast Amounts
Accumulated other comprehensive (loss) income | $ | (14) |  |  | $ | 168 |  | $ | (104) |  | $ | 64 |
Retained earnings | 14 |  |  | 9,623 |  | 104 |  | 9,727 |
Schedule of Consolidated Statements of Comprehensive Income with Change in Accounting Principle |
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
(in millions) | Change Impact |  | Previously Reported | Change Impact | Recast Amounts |  | Previously Reported | Change Impact | Recast Amounts
Other noninterest expenses | $ | (18) |  |  | $ | 96 |  | $ | (30) |  | $ | 66 |  |  | $ | 81 |  | $ | (6) |  | $ | 75 |
Provision for income taxes | $ | 4 |  |  | $ | 117 |  | $ | 7 |  | $ | 124 |  |  | $ | 334 |  | $ | 2 |  | $ | 336 |
Net income | $ | 14 |  |  | $ | 474 |  | $ | 23 |  | $ | 497 |  |  | $ | 1,198 |  | $ | 4 |  | $ | 1,202 |
Earnings per common share: |  |  |  |  |  |  |  |  |
Basic | $ | 0.10 |  |  | $ | 3.29 |  | $ | 0.16 |  | $ | 3.45 |  |  | $ | 7.95 |  | $ | 0.03 |  | $ | 7.98 |
Diluted | 0.11 |  |  | 3.27 |  | 0.16 |  | 3.43 |  |  | 7.87 |  | 0.03 |  | 7.90 |
Schedule of Consolidated Statements of Cash Flows with Change in Accounting Principle |
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
(in millions) | Change Impact |  | Previously Reported | Change Impact | Recast Amounts |  | Previously Reported | Change Impact | Recast Amounts
Net income | $ | 14 |  |  | $ | 474 |  | $ | 23 |  | $ | 497 |  |  | $ | 1,198 |  | $ | 4 |  | $ | 1,202 |
Provision (benefit) for deferred income taxes | 4 |  | (89) |  | 7 |  | (82) |  |  | 12 |  | 2 |  | 14 |
Net periodic defined benefit credit | (18) |  |  | (25) |  | (30) |  | (55) |  |  | (29) |  | (6) |  | (35) |

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