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Stock Compensation Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock based Compensation Plans        
Allocated Share-based Compensation Expense $ 34 $ 18 $ 53 $ 32
Income tax benefit (12) (6) (19) (11)
Total stock-based compensation plans expense, after-tax 22 12 34 21
Stock Compensation Plans (Textual) [Abstract]        
Total compensation cost related to non-vested awards not yet recognized 127   127  
Weighted average period of compensation cost recognized (in years) 2 years 73 days      
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost 16      
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost, recognized during the period $ 11