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Shareholders' Equity - Total Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Note [Abstract]      
Stock-based compensation expense, pre-tax $ 38 $ 42 $ 23
Income tax benefit recognized in earnings $ 7 $ 17 $ 9
Officers and Select Executives [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 3 years    
Officers and Select Executives [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award - Maximum over-achievement 100.00%    
Award vesting period 3 years