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Equity-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Dec. 18, 2006
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Original number of shares approved for issuance and stock-based awards         37,000,000
Shares available to issue due to cancellations and forfeitures 8,000,000        
Shares of common stock approved for issuance for stock and stock-based awards         52,500,000
Number of shares available under 2006 plan   60,500,000      
Shares awarded under the 2006 Plan   52,400,000 45,300,000 32,800,000  
Shares not delivered available for reissue under 2006 plan   14,000,000      
Compensation and employee benefits expense recognized in income statement   $ 355 $ 353 $ 261  
Expense associated with expense acceleration in connection with the restructuring plan   3 26    
Aggregate income tax benefit related to compensation expense   140 139 103  
Total intrinsic value of options exercised   42 8 6  
Restricted Stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of awards vested   57 64 66  
Unrecognized compensation cost, net of estimated forfeitures   8      
Unrecognized compensation cost, net of estimated forfeitures, period, years   6 months      
Deferred Stock Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, weighted-average grant date fair value   $ 54.16   $ 38.48  
Total fair value of awards vested   259 223 107  
Unrecognized compensation cost, net of estimated forfeitures   400      
Unrecognized compensation cost, net of estimated forfeitures, period, years   2 years 4 months 24 days      
Performance Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, weighted-average grant date fair value   $ 53.60 $ 37.78 $ 42.28  
Total fair value of awards vested   34 28 10  
Unrecognized compensation cost, net of estimated forfeitures   $ 6      
Unrecognized compensation cost, net of estimated forfeitures, period, years   1 year 8 months 12 days      
Maximum | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period   10 years      
Maximum | Restricted Stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Maximum | Deferred Stock Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Maximum | Performance Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Minimum | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Minimum | Restricted Stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Minimum | Deferred Stock Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   2 years      
Minimum | Performance Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year