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Share-Based Incentive Compensation (details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Share-Based Incentive Compensation disclosure      
Stock options vested at end of period, number (in shares) 8,892,757    
Stock options vested at end of period, weighted average exercise price (per share) $ 57.11    
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 $ 249    
Stock options exercisable at end of period, number (in shares) 6,071,383    
Stock options exercisable at end of period, weighted average exercise price (per share) $ 50.13    
Stock options exercisable at end of period, weighted average contractual life remaining 4 years 10 months 24 days    
Stock options exercisable at end of period, aggregate intrinsic value 212    
Total compensation cost recognized in earnings for all share-based incentive compensation awards 44 41  
Tax benefits recognized in earnings related to compensation costs 15 14  
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 209   $ 120
Weighted-average period of recognition for unrecognized compensation cost (in years) 2 years 2 months 12 days   1 year 8 months 12 days