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Computer Software (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Computer Software      
Computer software $ 2,376 $ 2,300  
Accumulated amortization (768) (716)  
Computer software, net of accumulated amortization 1,608 1,584  
Amortization expense for computer software 507 231 $ 215
Software [Member]      
Computer Software      
Amortization expense for computer software 396 229 $ 210
Software from Acquisition [Member]      
Computer Software      
Computer software 1,138 1,189  
Capitalized Software Development Costs [Member]      
Computer Software      
Computer software 1,066 985  
Purchased Software [Member]      
Computer Software      
Computer software $ 172 $ 126