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Parent Company Only Financial Information - Condensed Statements of Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 2,092 $ 1,689 $ 1,708
Other income 17 9 6
Operating expenses 604 518 511
Income tax benefit (176) (210) (77)
Net income 650 596 511
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Dividends received from subsidiaries 335 4 380
Other income 160 1 1
Gross income 495 381 381
Operating expenses 55 50 52
Income before income tax benefit and equity in undistributed earnings of subsidiaries 440 331 329
Income tax benefit 14 14 14
Income before equity in undistributed earnings of subsidiaries 454 345 343
Equity in undistributed earnings of subsidiaries 196 251 168
Net income $ 650 $ 596 $ 511