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Net Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Weighted Average Number of Shares Outstanding 547.5 536.3
Weighted Average Number of Fully Vested Restricted Stock Units and Performance Share Units Outstanding 0.5 0.4
Weighted Average Number of Shares Outstanding, Basic 548.0 536.7
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.0 0.5
Weighted Average Number of Shares Outstanding, Diluted 548.0 537.2
Net Income (Loss) Available to Common Stockholders, Basic $ (2,442) $ 255
Earnings Per Share, Basic $ (4.46) $ 0.48
Earnings Per Share, Diluted $ (4.46) $ 0.47