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Share Based Payment and Other Benefits (Summary of Restricted Stock Unit Activity) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aggregate intrinsic value, options outstanding at December 31, 2012 $ 156    
Restricted Stock Units (RSUs) [Member]
     
Outstanding at January 1, 2012 614    
Granted 165    
Converted (215)    
Forfeited/expired (19)    
Outstanding at December 31, 2012 545 614  
Units vested at December 31, 2012 528    
Weighted-average grant-date fair value, units outstanding at January 1, 2012 $ 217    
Weighted-average grant-date fair value, granted $ 422 $ 257 $ 231
Weighted-average grant-date fair value, converted $ 163    
Weighted-average grant-date fair value, forfeited/expired $ 273    
Weighted-average grant-date fair value, units outstanding at December 31, 2012 $ 298 $ 217  
Weighted-average grant-date fair value, units vested at December 31, 2012 $ 300    
Weighted-average remaining contractual term (in years), outstanding at December 31, 2012 1 year 2 months 12 days    
Aggregate intrinsic value, options outstanding at December 31, 2012 268    
Weighted-average remaining contractual term (in years), units vested at December 31, 2012 1 year 3 months 18 days    
Aggregate intrinsic value, units vested at December 31, 2012 $ 259