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Balance Sheet Components Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Accounts Receivable, Allowance for Credit Loss $ 20 $ 16
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 8 15
Accounts Receivable, Allowance for Credit Loss, Writeoff (8) (12)
Accounts Receivable, Allowance for Credit Loss, Recovery 2 3
Accounts Receivable, Allowance for Credit Loss $ 22 $ 22