Debt - Schedule of Interest Expense (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Contractual interest coupon		$ 12	$ 73	$ 65
Amortization of debt issuance costs		5	7	7
Amortization of debt discounts	[1]		173	148
Losses on extinguishment of debt	[1]		(105)
Total		$ 17	$ 358	$ 220

[1] Under the modified retrospective method of adoption of ASU 2020-06, there was neither amortization of debt discounts, nor losses on extinguishment of debt recognized for the year ended December 31, 2021. Refer to discussion above for further details.