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Share-based Compensation and Employee Benefits (Other Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 8 $ 8 $ 8