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Share-Based Incentive Compensation (details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
May 27, 2014
Share-Based Incentive Compensation disclosure            
Stock options vested at end of period, number (in shares) 7,597,990   7,597,990      
Stock options vested at end of period, weighted average exercise price (per share) $ 58.48   $ 58.48      
Stock options vested at end of period, weighted average contractual life remaining     6 years 0 months 0 days      
Stock options vested at end of period, aggregate intrinsic value $ 269   $ 269      
Stock options exercisable at end of period, number (in shares) 4,775,291   4,775,291      
Stock options exercisable at end of period, weighted average exercise price (per share) $ 50.40   $ 50.40      
Stock options exercisable at end of period, weighted average contractual life remaining     4 years 7 months 6 days      
Stock options exercisable at end of period, aggregate intrinsic value 208   208      
Total compensation cost recognized in earnings for all share-based incentive compensation awards 31 29 106 99    
Tax benefits recognized in earnings related to compensation costs 10 10 36 34    
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 151   $ 151   $ 120  
Weighted-average period of recognition for unrecognized compensation cost (in years)     1 year 9 months 18 days   1 year 8 months 12 days  
Number of shares initially available for issuance under the 2014 Incentive Plan           10,000,000