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Stock-based Compensation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share Based Compensation Expense [Line Items]        
RSUs and PSUs $ 33 $ 34 $ 102 $ 97
Stock options and equivalents 0 23 15 66
Stock-based compensation expense, before income taxes 33 57 117 163
Related tax benefit (12) (22) (45) (63)
Stock-based compensation expense, net of tax 21 35 72 100
Share-based Compensation [Abstract]        
Number of RSUs granted during the period     2  
Weighted average grant date fair value - RSUs     $ 65.13  
Number of stock options granted during the period     2  
Weighted average per unit exercise price - options     $ 65.91  
Unrecognized future expense of RSUs 221   221  
Unrecognized future expense of stock options 64   64  
Term until expiration - options     8 years  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period over which grants vest     4 years  
Weighted average period to expense unrecognized stock-based compensation expense     2 years 6 months  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period to expense unrecognized stock-based compensation expense     2 years 5 months  
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout on stock-based compensation award (percent)     120.00%  
Service period over which grants vest     4 years  
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout on stock-based compensation award (percent)     0.00%  
Service period over which grants vest     1 year  
Discontinued Operations [Member]
       
Share Based Compensation Expense [Line Items]        
Stock-based compensation expense, net of tax   $ 10 $ 5 $ 14