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Certain Employee Benefit and Stock Based Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation [Abstract]    
Share-based Compensation $ 84 $ 56
Maximum life of options (in years) 10 years  
Treasury stock 2,000,000  
Vesting period for restricted stock/unit awards, lower range 36 months  
Vesting period for restricted stock/unit awards, upper range 60 months  
Unamortized share based compensation expense related to nonvested equity compensation arrangements $ 179  
Cash-payable restricted share units outstanding 829,615