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Acquisitions And Divestitures Acquisition of Antaya Technologies Corp. (Details) - USD ($)
$ in Millions
Oct. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill   $ 1,539 $ 656 $ 496
Antaya Technologies Corp.        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Equity Interests Acquired 100.00%      
Total purchase price $ 151      
Purchase price, cash consideration, net of cash acquired 140      
Contingent consideration liability 11      
Contingent Consideration Arrangement, Range of Outcomes, Value, High 40      
Contingent Consideration Arrangement, Range of Outcomes, Value, Low $ 0      
Contingent Consideration Period 3 years      
Definite-lived intangible assets $ 75      
Other assets purchased and liabilities assumed, net (17)      
Identifiable net assets acquired 58      
Goodwill 93      
Total purchase price allocation $ 151      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years