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Condensed Consolidated Financial Statement Details - (Summary of Net Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Condensed Consolidated Financial Statement Details [Abstract]    
Property and equipment, cost $ 1,675 $ 1,657
Property and equipment, accumulated depreciation and amortization 1,118 1,047
Property and equipment, net 557 610
Intangible assets, cost 6,325 6,369
Intangible assets, accumulated depreciation and amortization 2,801 2,484
Intangible assets, net 3,524 3,885
Computer software, cost 2,956 2,862
Computer software, accumulated depreciation and amortization 1,233 1,134
Computer software, net $ 1,723 $ 1,728