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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings:        
Net income (loss) $ (22) $ 213 $ 461 $ 283
Shares:        
Weighted average outstanding shares 68 68 68 65
Equivalent shares from outstanding stock awards 0 0 0 0
Denominator for diluted calculation 68 68 68 65
Earnings Per Share:        
Basic earnings per share $ (0.32) $ 3.13 $ 6.78 $ 4.39
Diluted earnings per share $ (0.32) $ 3.12 $ 6.74 $ 4.36