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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Weighted Average Number of Shares Outstanding, Basic 68,000,000 62,000,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 1,000,000
Weighted Average Number of Shares Outstanding, Diluted 68,000,000 63,000,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   1,000,000
Weighted Average Number Diluted Shares Outstanding Adjustment   63,000,000