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Summary of Quarterly Financial Statements (Unaudited) Summary of Quarterly Financial Statements (Unaudited ) (Tables) | 12 Months Ended
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Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Statements | The following quarterly information is unaudited. However, in the opinion of management, the information reflects all adjustments, which are necessary for the fair presentation of the results of operations, for the periods presented.
| 2021
(in millions, except per share data) | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Interest income | $ | 474 |  |  | $ | 489 |  |  | $ | 479 |  |  | $ | 459 |
Interest expense | 13 |  |  | 14 |  |  | 14 |  |  | 16 |
Net interest income | 461 |  |  | 475 |  |  | 465 |  |  | 443 |
Provision for credit losses | (25) |  |  | (42) |  |  | (135) |  |  | (182) |
Noninterest income | 289 |  |  | 280 |  |  | 284 |  |  | 270 |
Noninterest expenses | 486 |  |  | 465 |  |  | 463 |  |  | 447 |
Provision for income taxes | 61 |  |  | 70 |  |  | 93 |  |  | 98 |
Net income | 228 |  |  | 262 |  |  | 328 |  |  | 350 |
Less: |  |  |  |  |  |  |
Income allocated to participating securities | 1 |  |  | 1 |  |  | 2 |  |  | 1 |
Preferred stock dividends | 6 |  |  | 6 |  |  | 5 |  |  | 6 |
Net income attributable to common shares | $ | 221 |  |  | $ | 255 |  |  | $ | 321 |  |  | $ | 343 |
Earnings per common share: |  |  |  |  |  |  |
Basic | $ | 1.69 |  |  | $ | 1.92 |  |  | $ | 2.35 |  |  | $ | 2.46 |
Diluted | 1.66 |  |  | 1.90 |  |  | 2.32 |  |  | 2.43 |
Comprehensive income | 223 |  |  | 175 |  |  | 313 |  |  | 181 |
| 2020
(in millions, except per share data) | Fourth Quarter (Recast) |  | Third Quarter (Recast) |  | Second Quarter (Recast) |  | First Quarter (Recast)
Interest income | $ | 489 |  |  | $ | 484 |  |  | $ | 511 |  |  | $ | 609 |
Interest expense | 20 |  |  | 26 |  |  | 40 |  |  | 96 |
Net interest income | 469 |  |  | 458 |  |  | 471 |  |  | 513 |
Provision for credit losses | (17) |  |  | 5 |  |  | 138 |  |  | 411 |
Net securities gains (losses) | — |  |  | — |  |  | 1 |  |  | (1) |
Noninterest income excluding net securities gains (losses) | 265 |  |  | 252 |  |  | 246 |  |  | 238 |
Noninterest expenses (a) | 465 |  |  | 438 |  |  | 434 |  |  | 417 |
Provision (benefit) for income taxes (a) | 65 |  |  | 50 |  |  | 28 |  |  | (19) |
Net income (loss) (a) | 221 |  |  | 217 |  |  | 118 |  |  | (59) |
Less: |  |  |  |  |  |  |
Income allocated to participating securities | 1 |  |  | — |  |  | 1 |  |  | — |
Preferred stock dividends | 5 |  |  | 8 |  |  | — |  |  | — |
Net income (loss) attributable to common shares (a) | $ | 215 |  |  | $ | 209 |  |  | $ | 117 |  |  | $ | (59) |
Earnings (loss) per common share: |  |  |  |  |  |  |
Basic (a) | $ | 1.54 |  |  | $ | 1.49 |  |  | $ | 0.85 |  |  | $ | (0.42) |
Diluted (a) | 1.53 |  |  | 1.48 |  |  | 0.84 |  |  | (0.42) |
Comprehensive income | 267 |  |  | 169 |  |  | 97 |  |  | 344 |
(a)Recast to reflect the retrospective application of the Corporation's election to change the accounting methodology for certain components of defined pension benefit credit. Refer to Note 1 for further information.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124502072&loc=d3e1280-108306 + Details
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