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Summary of Quarterly Financial Statements (Unaudited) Summary of Quarterly Financial Statements (Unaudited) (Summary of Quarterly Financial Statements) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 474 $ 489 $ 479 $ 459 $ 489 $ 484 $ 511 $ 609 $ 1,901 $ 2,093 $ 2,807
Interest expense 13 14 14 16 20 26 40 96 57 182 468
Net interest income 461 475 465 443 469 458 471 513 1,844 1,911 2,339
Provision for credit losses (25) (42) (135) (182) (17) 5 138 411 (384) 537 74
Net securities gains (losses)         0 0 1 (1) 0 0 (7)
Noninterest income excluding net securities gains (losses) 289 280 284 270 265 252 246 238      
Noninterest expenses 486 465 463 447 465 [1] 438 [1] 434 [1] 417 [1] 1,861 1,754 [2] 1,737 [2]
Provision (benefit) for income taxes 61 70 93 98 65 [1] 50 [1] 28 [1] (19) [1] 322 124 [2] 336 [2]
Net Income 228 262 328 350 221 [1] 217 [1] 118 [1] (59) [1] 1,168 497 [2] 1,202 [2]
Less income allocated to participating securities 1 1 2 1 1 0 1 0 5 2 7
Less preferred stock dividends 6 6 5 6 5 8 0 0      
Net income attributable to common shares $ 221 $ 255 $ 321 $ 343 $ 215 [1] $ 209 [1] $ 117 [1] $ (59) [1] $ 1,140 $ 482 $ 1,195
Basic earnings per common share $ 1.69 $ 1.92 $ 2.35 $ 2.46 $ 1.54 [1] $ 1.49 [1] $ 0.85 [1] $ (0.42) [1] $ 8.45 $ 3.45 $ 7.98
Diluted earnings per common share $ 1.66 $ 1.90 $ 2.32 $ 2.43 $ 1.53 [1] $ 1.48 [1] $ 0.84 [1] $ (0.42) [1] $ 8.35 $ 3.43 $ 7.90
Comprehensive income $ 223 $ 175 $ 313 $ 181 $ 267 [1] $ 169 [1] $ 97 [1] $ 344 [1] $ 892 $ 877 $ 1,572
[1] 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.
[2] See Defined Benefit Pension and Other Postretirement Costs in Note 1.