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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Business Acquisition [Line Items]      
Payments for acquisitions of businesses $ 265 $ 0  
Goodwill 5,380   $ 5,200
Software      
Business Acquisition [Line Items]      
Impairment of intangible assets, finite-lived 10    
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Payments for acquisitions of businesses 265    
Recognized identifiable assets acquired, finite-lived intangibles 75    
Goodwill 180    
Recognized identifiable assets acquired, net other assets $ 10