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Parent Company Financial Statements Parent Company Financial Statements (Statements of Cash Flows) (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
 [1]
Jun. 30, 2020
 [1]
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss) $ 228 $ 262 $ 328 $ 350 $ 221 [1] $ 217 $ 118 $ (59) [1] $ 1,168 $ 497 [2] $ 1,202 [2]
Depreciation and amortization                 99 108 114
Net periodic defined benefit credit                 (81) (55) (35)
Share-based compensation expense                 41 24 39
Benefit for deferred income taxes                 79 (82) 14
Other, net                 469 111 318
Net cash provided by operating activities                 634 928 1,090
Other, net                 70 79 86
Net cash used in investing activities                 1,723 (4,602) (494)
Issuances and advances of medium- and long-term debt                 0 0 1,050
Cash dividends paid on preferred stock                 23 8 0
Repurchases of common stock                 729 199 1,394
Cash dividends paid on common stock                 369 375 402
Net cash provided by (used in) financing activities                 4,555 13,623 661
Net increase (decrease) in cash and cash equivalents                 6,912 9,949 1,257
Cash and cash equivalents at beginning of period       15,767       5,818 15,767 5,818 4,561
Cash and cash equivalents at end of period 22,679       15,767       22,679 15,767 5,818
Interest paid                 57 203 462
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 1,168 497 1,202
Undistributed (losses) earnings of subsidiaries, principally banks                 (339) (17) 2
Depreciation and amortization                 0 0 1
Net periodic defined benefit credit                 5 4 4
Share-based compensation expense                 19 11 15
Benefit for deferred income taxes                 (2) (1) (2)
Other, net                 3 2 28
Net cash provided by operating activities                 854 496 1,250
Advance to subsidiary bank                 (150) 0 0
Capital transactions with subsidiaries                 0 (21) 0
Other, net                 (1) 2 0
Net cash used in investing activities                 (151) (19) 0
Maturities of medium- and long-term debt                 0 0 (350)
Issuances and advances of medium- and long-term debt                 0 0 550
Issuances of preferred stock                 0 394 0
Cash dividends paid on preferred stock                 (23) (8) 0
Repurchases of common stock                 (729) (199) (1,394)
Cash dividends paid on common stock                 (369) (375) (402)
Issuances of common stock under employee stock plans                 34 4 18
Net cash provided by (used in) financing activities                 (1,087) (184) (1,578)
Net increase (decrease) in cash and cash equivalents                 (384) 293 (328)
Cash and cash equivalents at beginning of period       $ 1,489       $ 1,196 1,489 1,196 1,524
Cash and cash equivalents at end of period $ 1,105       $ 1,489       1,105 1,489 1,196
Interest paid                 $ 21 $ 33 $ 55
[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.