Fair Value Measurement - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Measured at Fair Value on Recurring Basis - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Total assets recorded at fair value	$ 5
Liabilities
Total liabilities recorded at fair value	973	$ 73
Interest Rate Swaps
Assets
Total assets recorded at fair value	5
Liabilities
Total liabilities recorded at fair value	13	47
Contingent Consideration Liability
Liabilities
Total liabilities recorded at fair value	29	26
Seller Earnouts Liability
Liabilities
Total liabilities recorded at fair value	144
Warrant Liability
Liabilities
Total liabilities recorded at fair value	182
Tax Receivable Agreement Liability
Liabilities
Total liabilities recorded at fair value	605
Level 1
Liabilities
Total liabilities recorded at fair value	182
Level 1 | Warrant Liability
Liabilities
Total liabilities recorded at fair value	182
Level 2
Assets
Total assets recorded at fair value	5
Liabilities
Total liabilities recorded at fair value	13	47
Level 2 | Interest Rate Swaps
Assets
Total assets recorded at fair value	5
Liabilities
Total liabilities recorded at fair value	13	47
Level 3
Liabilities
Total liabilities recorded at fair value	778	26
Level 3 | Contingent Consideration Liability
Liabilities
Total liabilities recorded at fair value	29	$ 26
Level 3 | Seller Earnouts Liability
Liabilities
Total liabilities recorded at fair value	144
Level 3 | Tax Receivable Agreement Liability
Liabilities
Total liabilities recorded at fair value	$ 605