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Stock-Based Compensation Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 01, 2013
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
May 05, 2016
shares
May 04, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense | $   $ 10 $ 7 $ 28 $ 24    
NSO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rights, percent       25.00%      
Maximum contractual term, NSO award       10 years      
RSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rights, percent       25.00%      
Granted (shares)       819,301      
PSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares) [1]       295,390      
Supplemental Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       214,416      
Three Year Performance Period | PSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period, award (years)       3 years      
2016 Incentive Compensation Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for issuance under Equity Incentive Plan (shares)           5,100,000  
Number of shares available for grant under Equity Incentive Plan (shares)   4,451,948   4,451,948      
2016 Directors Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for issuance under Equity Incentive Plan (shares)           200,000  
Number of shares available for grant under Equity Incentive Plan (shares)   200,000   200,000      
2013 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for issuance under Equity Incentive Plan (shares) 5,263,000            
Number of shares available for grant under Equity Incentive Plan (shares)             616,332
Stock awarded pursuant to Equity Incentive Plan limitations, percent 5.00%            
Class A Common Stock | Supplemental Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Consecutive trading days       10      
Stock price incremental increase (usd per share)   2   2      
Class A Common Stock | Supplemental Performance Shares | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock price (usd per share) | $ / shares   $ 44   $ 44      
Class A Common Stock | Supplemental Performance Shares | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock price (usd per share) | $ / shares   $ 64   $ 64      
[1] Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP. Includes 214,416 Supplemental PSUs with an average fair value of $16.13 which was determined using a Monte Carlo simulation model, as further described above.