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Condensed Consolidated Financial Statement Details - (Summary of Net Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Condensed Consolidated Financial Statement Details [Abstract]    
Property and equipment, cost $ 1,650 $ 1,645
Property and equipment, accumulated depreciation and amortization 1,094 1,058
Property and equipment, net 556 587
Intangible assets, cost 6,155 6,122
Intangible assets, accumulated depreciation and amortization 3,136 2,990
Intangible assets, net 3,019 3,132
Computer software, cost 3,143 3,103
Computer software, accumulated depreciation and amortization 1,366 1,308
Computer software, net $ 1,777 $ 1,795