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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to the Company's unvested stock option grants, restricted stock grants, and performance units $ 93  
Weighted average period over which cost is recognized, years 3 years  
Performance Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for stock awards from grant date 3 years  
Deferred tax liability recorded $ 27 $ 51