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Share-Based Compensation - Performance Share Unit Breakout (Details) - Performance Shares [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Jan. 01, 2016
Jan. 01, 2015
Jan. 01, 2014
Payable 2019 [Member] | Year of 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,348,893      
Fair Value of Share Based Award $ 11 $ 10    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 2      
Payable 2018 [Member] | Year of 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 629,694      
Fair Value of Share Based Award $ 2   $ 13  
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 1      
Payable 2017 [Member] | Year of 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 561,215      
Fair Value of Share Based Award $ 1     $ 16
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 1