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Parent Company Financial Information - Statements of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dividend income:      
Other income $ 123 $ 120 $ 84
Provision for credit losses 503 45 8
Interest expense:      
Interest on term borrowings 64 53 53
Total interest expense 236 414 326
Personnel expense 1,033 695 658
Income tax benefit 76 134 157
Equity in undistributed net income (loss) of subsidiaries:      
Net income attributable to controlling interest 845 441 545
Parent Company      
Dividend income:      
Bank 180 345 420
Non-bank 0 1 1
Total dividend income 180 346 421
Other income 0 1 0
Total income 180 347 421
Provision for credit losses 0 (1) 0
Interest expense:      
Interest on term borrowings 39 31 31
Personnel expense 54 53 54
Total expense 93 83 85
Income before income taxes 87 264 336
Income tax benefit (18) (19) (39)
Income before equity in undistributed net income of subsidiaries 105 283 375
Equity in undistributed net income (loss) of subsidiaries:      
Bank 736 160 171
Non-bank 4 (2) (1)
Net income attributable to controlling interest $ 845 $ 441 $ 545