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Employee Stock Ownership Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Shares in ESOP (in shares) 15,806,529 18,400,412  
Outstanding borrowings in the ESOP $ 3    
Common shares released and allocated to participant accounts (in shares) 13,237,788    
Common shares available for future allocation to participant accounts (in shares) 2,568,741    
Annual ESOP expense $ 0 $ 0 $ 0
Dividends paid by the Company on shares held by the ESOP 29 32 35
Company contributions to the ESOP $ 0 $ 0 $ 0