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Compensation Plans - Stock Based Compensation (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
participant
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 01, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized | $ $ 14 $ 23 $ 26  
Deferred compensation cost | $ $ 20 14    
Total unrecognized compensation cost, period of recognition 3 years      
Business days, period 5 days      
Number of impacted participants on spin off | participant 133      
Former Chairman, Chief Executive Officer and President        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized | $   $ 7    
2006 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for future awards (in shares)       0
2014 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for future awards (in shares) 30,000,000      
Maximum number of shares reserved for awards (in shares)       33,000,000
Maximum number of shares available for future awards to be issued as restricted stock and performance restricted stock unit 20,000,000