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Parent Company Financial Statements Parent Company Financial Statements (Statements of Income) (Details) - USD ($)
$ 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
Condensed Financial Statements, Captions [Line Items]                      
Other interest income                 $ 27 $ 29 $ 71
Interest on medium- and long-term debt [1]                 35 80 197
Salaries and benefits expense                 1,133 1,019 1,020
Other noninterest expenses                 39 66 75
Benefit for income taxes $ 61 $ 70 $ 93 $ 98 $ 65 [2] $ 50 [2] $ 28 [2] $ (19) [2] 322 124 [3] 336 [3]
Net Income 228 262 328 350 221 [2] 217 [2] 118 [2] (59) [2] 1,168 497 [3] 1,202 [3]
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 [2] $ 209 [2] $ 117 [2] $ (59) [2] 1,140 482 1,195
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from subsidiaries                 849 498 1,229
Other interest income                 1 4 20
Intercompany management fee                 235 209 224
Total income                 1,085 711 1,473
Interest on medium- and long-term debt                 20 30 56
Salaries and benefits expense                 170 141 143
Other noninterest expenses                 72 66 79
Total expenses                 262 237 278
Income before benefit for income taxes and equity in undistributed earnings (losses) of subsidiaries                 823 474 1,195
Benefit for income taxes                 (6) (6) (9)
Income before equity in undistributed earnings (losses) of subsidiaries                 829 480 1,204
Equity in undistributed earnings of subsidiaries, principally banks [4]                 339 17 (2)
Net Income                 1,168 497 1,202
Less income allocated to participating securities                 5 2 7
Less preferred stock dividends                 23 13 0
Net income attributable to common shares                 $ 1,140 $ 482 $ 1,195
[1] Includes the effects of hedging.
[2] 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.
[3] See Defined Benefit Pension and Other Postretirement Costs in Note 1.
[4] Amounts for the years ended December 31, 2020 and December 31, 2019 have been recast to reflect the retrospective application of the     Corporation's election to change the accounting method for certain components of the qualified defined benefit pension plan as of January 1, 2021. Refer to Note 1 for further information.