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Equity-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended 84 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period 65,700,000 60,900,000 56,900,000  
Shares awarded, but not delivered, available for reissue 23,700,000     23,700,000
Shares available for grant 18,500,000     18,500,000
Options granted (in shares)       0
Options outstanding (in shares) 0     0
Allocated share-based compensation $ 268,000,000 $ 319,000,000 $ 329,000,000  
Accelerated recognition due to restructuring plan $ 9,000,000 $ 10,000,000 $ 20,000,000  
Stock Options and SARs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 955,000 1,206,000 1,861,000 955,000
Intrinsic value of exercises in period $ 1,000,000 $ 5,000,000 $ 14,000,000  
Unrecognized share-based compensation expense for stock options $ 0     $ 0
Stock Options and SARs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Stock Options and SARs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 10 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 0      
Fair value for vested in period   $ 1,000,000 54,000,000  
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Deferred Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 4,336,000 3,461,000    
Fair value for vested in period $ 275,000,000 $ 340,000,000 310,000,000  
Costs not yet recognized $ 252,000,000     252,000,000
Granted (in USD per share) $ 52.49 $ 72.98    
Period of recognition for unrecognized share-based compensation 2 years 4 months 24 days      
Deferred Stock Awards | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Deferred Stock Awards | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 506,000 400,000    
Fair value for vested in period $ 21,000,000 $ 39,000,000 $ 44,000,000  
Costs not yet recognized $ 3,900,000     $ 3,900,000
Granted (in USD per share) $ 50.81 $ 72.24    
Period of recognition for unrecognized share-based compensation 2 years 1 month 6 days      
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares)   955