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Stock-Based Compensation Plans (Details Textuals) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period 3 years    
Realized tax benefits $ 15,000,000 $ 15,000,000 $ 13,000,000
Tax benefit associated with stock-based compensation expense $ 18,000,000 10,000,000 $ 14,000,000
Stock option expiration period 10 years    
Stock options granted in period (shares) 0    
Cash received from stock options exercised $ 12,000,000 0  
Weighted-average remaining contractual term of options outstanding 1 year 4 months 6 days    
Share-based liabilities paid   0  
EDCP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferral period (years) 3 years    
DCPD      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Net liability recognized $ 9,000,000 $ 8,000,000  
Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award paid in stock (percent) 66.67%    
Award paid in cash (percent) 33.33%    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period 3 years    
Liability recognized $ 56,000,000    
Share-based compensation expense $ 30,000,000    
Granted (in dollars per share) $ 36.78 $ 31.71 $ 34.77
Fair value of restricted stock units vested $ 62,000,000 $ 42,000,000 $ 36,000,000
Unrecognized cost $ 30,000,000    
Unrecognized cost, period for recognition 3 years    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period 3 years    
Share-based liabilities paid $ 0   $ 2,000,000
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period 10 years    
ICP 2007      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum limit of total stock awards (in shares) 29,000,000    
Stock-based compensation award number of shares available for future 0    
ICP 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum limit of total stock awards (in shares) 10,000,000    
Stock-based compensation award number of shares available for future 4,700,000    
401(k) Savings Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for issuance 1,260,189 1,300,000.0