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Balance Sheet Components Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Accounts Receivable, Allowance for Credit Loss $ 22 $ 16
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 11 26
Accounts Receivable, Allowance for Credit Loss, Writeoff (7) (19)
Accounts Receivable, Allowance for Credit Loss, Recovery 1 4
Accounts Receivable, Allowance for Credit Loss $ 27 $ 27