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Condensed Consolidated Financial Statement Details - (Summary of Net Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Condensed Consolidated Financial Statement Details [Abstract]    
Property and equipment, cost $ 1,521 $ 1,488
Property and equipment, accumulated depreciation and amortization 937 862
Property and equipment, net 584 626
Intangible assets, cost 6,412 6,547
Intangible assets, accumulated depreciation and amortization 2,162 1,883
Intangible assets, net 4,250 4,664
Computer software, cost 2,552 2,376
Computer software, accumulated depreciation and amortization 846 768
Computer software, net $ 1,706 $ 1,608