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Condensed Consolidated Financial Statement Details - (Summary of Net Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Condensed Consolidated Financial Statement Details [Abstract]    
Property and equipment, cost $ 1,620 $ 1,522
Property and equipment, accumulated depreciation and amortization 1,044 896
Property and equipment, net 576 626
Intangible assets, cost 6,464 6,547
Intangible assets, accumulated depreciation and amortization 2,375 1,883
Intangible assets, net 4,089 4,664
Computer software, cost 2,788 2,358
Computer software, accumulated depreciation and amortization 1,082 750
Computer software, net $ 1,706 $ 1,608