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Certain Employee Benefit and Stock Based Compensation Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation [Abstract]    
Share-based compensation expense $ 133 $ 114
Unamortized share-based compensation expense related to nonvested equity compensation arrangements 176  
Maximum life of options (in years) 10 years 0 months  
Treasury stock 2.0  
Performance period for restricted stock/unit awards, lower range 3 years 0 months  
Performance period for restricted stock/unit awards, upper range 4 years 0 months  
Aggregate intrinsic value - Nonvested cash-payable incentive/performance units and restricted share units $ 72  
Period over which unamortized share-based compensation expense will be amortized. 5 years 0 months