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Condensed Consolidated Financial Statement Details - Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Platform Initiatives        
Finite-Lived Intangible Assets [Line Items]        
Software asset impairment $ 144      
Software amortization expense 83      
Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net 11,717   $ 11,717  
Amortization expense of intangible assets 595   1,789 $ 1,794
Trademarks and Other Intangible Assets        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net $ 323   $ 323  
Amortization expense of intangible assets   $ 602