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Share-Based Incentive Compensation (details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
May 27, 2014
Share-Based Incentive Compensation disclosure            
Stock options vested at end of period, number (in shares) 7,967,953   7,967,953      
Stock options vested at end of period, weighted average exercise price (per share) $ 58.07   $ 58.07      
Stock options vested at end of period, weighted average contractual life remaining     6 years 1 month 6 days      
Stock options vested at end of period, aggregate intrinsic value $ 287   $ 287      
Stock options exercisable at end of period, number (in shares) 5,137,812   5,137,812      
Stock options exercisable at end of period, weighted average exercise price (per share) $ 50.32   $ 50.32      
Stock options exercisable at end of period, weighted average contractual life remaining     4 years 8 months 12 days      
Stock options exercisable at end of period, aggregate intrinsic value 225   225      
Total compensation cost recognized in earnings for all share-based incentive compensation awards 31 29 75 70    
Tax benefits recognized in earnings related to compensation costs 11 10 26 24    
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 180   $ 180   $ 120  
Weighted-average period of recognition for unrecognized compensation cost (in years)     2 years 0 months 0 days   1 year 8 months 12 days  
Number of shares initially available for issuance under the 2014 Incentive Plan           10,000,000