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Equity-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended 72 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period 60,900,000 56,900,000 52,400,000  
Shares awarded, but not delivered, available for reissue 21,100,000     21,100,000
Shares available for grant 20,800,000     20,800,000
Options granted (in shares)       0
Options outstanding (in shares) 0     0
Allocated share-based compensation $ 319,000,000 $ 329,000,000 $ 355,000,000  
Accelerated recognition due to restructuring plan 10,000,000 20,000,000 3,000,000  
Intrinsic value of exercises in period 5,000,000 $ 14,000,000 $ 42,000,000  
Unrecognized share-based compensation expense for stock options $ 0     $ 0
Stock Options and SARs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 1,206,000 1,861,000 2,664,000 1,206,000
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]        
Fair value for vested in period $ 1,000,000 $ 54,000,000 $ 57,000,000  
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) 3,461,000 4,282,000    
Fair value for vested in period $ 340,000,000 $ 310,000,000 259,000,000  
Costs not yet recognized $ 301,000,000     $ 301,000,000
Granted (in USD per share) $ 72.98 $ 65.40    
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) 400,000 437,000    
Fair value for vested in period $ 39,000,000 $ 44,000,000 $ 34,000,000  
Costs not yet recognized $ 3,000,000     $ 3,000,000
Granted (in USD per share) $ 72.24 $ 64.56    
Period of recognition for unrecognized share-based compensation 1 year 9 months 18 days      
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       0
Options outstanding (in shares) 1,206     1,206
Other awards outstanding (in shares) 0     0