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Employee Stock Ownership Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Shares in ESOP (in shares) 13,359,448 15,806,529  
Outstanding borrowings in the ESOP $ 2    
Common shares released and allocated to participant accounts (in shares) 11,651,749    
Common shares available for future allocation to participant accounts (in shares) 1,707,699    
Annual ESOP expense $ 0 $ 0 $ 0
Dividends paid by the Company on shares held by the ESOP 25 29 32
Company contributions to the ESOP $ 0 $ 0 $ 0