Equity Incentive Plans - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended				6 Months Ended
	Mar. 31, 2018 USD ($) Milestone Tranches shares	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2021 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation						$ 779	$ 1,088
2018 CEO Performance Award [Member] | Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options grant | shares	101,300,000
Number of vesting tranches CEO Performance Award consists | Tranches	12
Award vesting description						Each of the 12 vesting tranches of the 2018 CEO Performance Award will vest upon certification by the Board of Directors that both (i) the market capitalization milestone for such tranche, which begins at $100.0 billion for the first tranche and increases by increments of $50.0 billion thereafter (based on both a six calendar month trailing average and a 30 calendar day trailing average, counting only trading days), has been achieved, and (ii) any one of the following eight operational milestones focused on total revenue or any one of the eight operational milestones focused on Adjusted EBITDA have been achieved for the four consecutive fiscal quarters on an annualized basis and subsequently reported by us in our consolidated financial statements filed with our Forms 10-Q and/or 10-K.
Increase to market capitalization for each remaining milestone	$ 50,000
Number of operational milestones focused on total revenue | Milestone	8
Number of operational milestones focused on adjusted EBITDA | Milestone	8
Payment of exercise price per share | $ / shares						$ 70.01
Holding period of shares post-exercise	5 years
Stock-based compensation		$ 8			$ 176	$ 57	$ 475
2018 CEO Performance Award [Member] | Chief Executive Officer [Member] | Operational Milestones Probable of Being Achieved [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized catch-up expense during period			$ 11
Unrecognized compensation expense		9				$ 9
Weighted-average period of recognition of unrecognized compensation, in years						3 months 18 days
2018 CEO Performance Award [Member] | Chief Executive Officer [Member] | First Tranche Milestone [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization	$ 100,000
Performance Based Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period, in years						2 years
Stock-based compensation		34				$ 103
Number of RSUs, Granted | shares				700,000
2021 Performance-Based Stock Option & RSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition of unrecognized compensation, in years						3 years
Aggregate catch-up expense			$ 30
2021 Performance-Based Stock Option & RSU Awards [Member] | Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense		$ 283				$ 283