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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 158 $ 160 $ 174
Tax benefit related to share-based compensation expense 56 55 60
Total unrecognized compensation cost related to non-vested awards $ 99    
Weighted-average period to recognize compensation cost 2 years 5 months    
Stock option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 39 37 36
Restricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense [1] 22 26 46
Restricted stock [Member] | Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 0 3 10
Restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 83 67 61
Liability awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 14 $ 30 $ 31
[1] Includes nil, $3 million and $10 million of expense related to EIP for the years ended December 31, 2015, 2014 and 2013, respectively