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Employee Stock Ownership Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Shares in ESOP (in shares) 18,400,412 21,082,162  
Outstanding borrowings in the ESOP $ 5    
Common shares released and allocated to participant accounts (in shares) 14,809,986    
Common shares available for future allocation to participant accounts (in shares) 3,590,426    
Annual ESOP expense $ 0 $ 0 $ 0
Dividends paid by the Company on shares held by the ESOP 32 35 38
Company contributions to the ESOP $ 0 $ 0 $ 0