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Share-Based Incentive Compenstaion (details) - Cost Recognition (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based compensation      
Total compensation cost recognized in earnings for all share-based incentive compensation awards $ 129 $ 120 $ 121
Tax benefit recognized in earnings related to compensation costs 45 42 42
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards 120    
Weighted-average period of recognition for unrecognized compensation cost (in years) 1 year 8 months 12 days    
Cash received from the exercise of employee stock options under share-based compensation plans 206 295 314
Tax benefit realized for tax deductions from employee stock options 42 36  
Minimum [Member]
     
Share-based compensation      
Estimated annual forfeiture rate reflected in share-based compensation cost (percent) 3.00%    
Maxiumum [Member]
     
Share-based compensation      
Estimated annual forfeiture rate reflected in share-based compensation cost (percent) 4.50%    
Performance shares [Member]
     
Share-based compensation      
Estimated attainment of performance shares (percent) 100.00%    
Compensation cost adjustments for the updated estimate of performance shares due to attaining certain performance levels $ 8 $ 4 $ 4