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Share-based Payments (Liability Classified) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Current portion of equity-based compensation liabilities $ 16 $ 31
Total liability for cash-settled awards, Current and Noncurrent 53 83
PRSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Current portion of equity-based compensation liabilities 14 29
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent 33 47
SARs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Current portion of equity-based compensation liabilities 2 2
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent $ 4 $ 5