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Earnings Per Share (Calculation of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic and diluted net earnings per share:                      
Net income (in usd) $ 148 $ 37 $ 31 $ 38 $ 118 $ 65 $ 139 $ 79 $ 254 $ 401 $ 549
Net income                 $ 254 $ 401 $ 549
Shares                      
Weighted average common shares outstanding                 180,094 179,958 179,750
Add: Participating securities                 22 29 27
Weighted average common shares outstanding — Basic                 180,116 179,987 179,777
Plus incremental shares from assumed conversions:                      
Weighted average common shares outstanding — Diluted                 181,099 181,196 181,132
Basic earnings per share (in usd per share) $ 0.82 $ 0.20 $ 0.17 $ 0.21 $ 0.66 $ 0.36 $ 0.77 $ 0.44 $ 1.41 $ 2.23 $ 3.05
Diluted earnings per share (in usd per share) $ 0.82 $ 0.20 $ 0.17 $ 0.21 $ 0.65 $ 0.36 $ 0.77 $ 0.43 $ 1.40 $ 2.21 $ 3.03
Stock Options                      
Plus incremental shares from assumed conversions:                      
Dilutive effect of common shares                 671 803 876
Restricted Stock                      
Plus incremental shares from assumed conversions:                      
Dilutive effect of common shares                 312 406 479