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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings:        
Net income $ 344 $ 158 $ 483 $ 70
Shares:        
Weighted average outstanding shares 68 63 68 63
Equivalent shares from outstanding stock options 1 1 1 1
Denominator for diluted calculation 69 64 69 64
Earnings Per Share:        
Basic earnings per share $ 5.06 $ 2.49 $ 7.11 $ 1.12
Diluted earnings per share $ 5.02 $ 2.48 $ 7.06 $ 1.11