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Earnings per Share - Earnings per share reconciliation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Schedule of Basic And Diluted Earnings [Line Items]    
Adjusted Net Income Available to Common Shareholders, Common $ (310) $ (52)
Preferred Stock Dividends and Other Adjustments 2 2
Net loss from continuing operations $ (308) $ (50)
Weighted average number of shares outstanding, Basic 207,944 205,093
Continuing operations, per basic share $ (1.49) $ (0.26)
Earnings Per Share, Basic $ (1.49) $ (0.26)
Weighted average number of shares outstanding, Diluted 207,944 205,093
Continuing operations, per diluted share $ (1.49) $ (0.26)
Earnings Per Share, Diluted $ (1.49) $ (0.26)
Stock Options [Member]    
Schedule of Basic And Diluted Earnings [Line Items]    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 0
Restricted Stock and Performance Shares [Member]    
Schedule of Basic And Diluted Earnings [Line Items]    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 0