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Parent Company Only Financial Information - Condensed Statements of Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,689.0 $ 1,708.0 $ 1,805.0
Dividends received from subsidiaries (380.0)    
Other income 9.0 6.0 19.0
Operating expenses 518.0 511.0 511.0
Income tax benefit (210.0) (77.0) (128.0)
Net income 596.0 511.0 395.0
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Dividends received from subsidiaries 380.0 380.0 380.0
Other income 1.0 1.0 1.0
Gross income 381.0 381.0 381.0
Operating expenses 50.0 52.0 50.0
Income before income tax benefit and equity in underdistributed earnings of subsidiaries 331.0 329.0 331.0
Income tax benefit 14.0 14.0 14.0
Income before equity in underdistributed earnings of subsidiaries 345.0 343.0 345.0
Equity in underdistributed earnings of subsidiaries 251.0 168.0 50.0
Net income $ 596.0 $ 511.0 $ 395.0