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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income (numerator for basic and diluted calculations) $ 158 $ 202 $ 70 $ 372
Shares:        
Weighted average outstanding shares (denominator for basic calculation) 63 63 63 63
Equivalent shares from outstanding stock options 1 1 1 1
Denominator for diluted calculation 64 64 64 64
Earnings Per Share:        
Basic earnings per share $ 2.49 $ 3.23 $ 1.12 $ 5.93
Diluted earnings per share $ 2.48 $ 3.18 $ 1.11 $ 5.83