Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance Sheet Components [Abstract]
Allowance for doubtful accounts and authorized credits	$ 74	$ 136
Allowance for doubtful accounts	42	97
Decrease in allowance for doubtful accounts receivable	55
Allowance for doubtful accounts receivable, write-offs	134
Deferred revenue recognized during period	$ 47	$ 64