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Equity-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
months
Dec. 31, 2010
Dec. 31, 2009
May 01, 2009
Original number of shares approved for issuance and stock-based awards       20
Shares of common stock approved for issuance for stock and stock-based awards       37
Shares awarded under the 2006 Plan 32.84 26.39 17.59  
Shares available to issue due to cancellations and forfeitures 8      
Compensation expense related to stock options, stock appreciation rights, restricted stock awards, deferred stock awards and performance awards $ 261 $ 229 $ 126  
Expense associated with expense acceleration in connection with the restructuring plan 25 12    
Aggregate income tax benefit related to compensation expense 103 95 50  
Weighted-average grant date fair value of options granted     $ 2.96  
Total intrinsic value of options exercised 6 2 5  
Unrecognized compensation cost, net of estimated forfeitures, period, months 7      
Restricted Stock [Member]
       
Unrecognized compensation cost, net of estimated forfeitures 101      
Unrecognized compensation cost, net of estimated forfeitures, period, years 2.1      
Total fair value of awards vested 66 23 20  
Weighted-average grant date fair value   $ 44.49 $ 34.58  
Deferred Stock Awards [Member]
       
Unrecognized compensation cost, net of estimated forfeitures 214      
Unrecognized compensation cost, net of estimated forfeitures, period, years 2.6      
Total fair value of awards vested 107 107 193  
Weighted-average grant date fair value $ 41.92 $ 42.45 $ 25.51  
Performance Awards [Member]
       
Unrecognized compensation cost, net of estimated forfeitures 29      
Unrecognized compensation cost, net of estimated forfeitures, period, years 1.7      
Total fair value of awards vested 10 12 23  
Weighted-average grant date fair value $ 42.28 $ 43.33 $ 19.46  
Maximum [Member]
       
Unrecognized compensation cost, net of estimated forfeitures $ 1      
Maximum [Member] | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   ten    
Maximum [Member] | Restricted Stock [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   four    
Maximum [Member] | Deferred Stock Awards [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   four    
Maximum [Member] | Performance Awards [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   four    
Minimum [Member] | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   four    
Minimum [Member] | Restricted Stock [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   three    
Minimum [Member] | Deferred Stock Awards [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   two    
Minimum [Member] | Performance Awards [Member]
       
Share-based compensation arrangement by share-based payment award, award vesting period, years   one