Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 31, 2020	Jun. 30, 2017
Debt Instrument [Line Items]
Operating lease costs	$ 27,000,000	$ 21,000,000	$ 73,000,000	$ 61,000,000
Operating lease liabilities, payments			56,000,000	42,000,000
Right-of-use assets obtained in exchange for operating lease liabilities			$ 216,000,000	$ 102,000,000
Weighted-average lease remaining lease term	9 years		9 years
Weighted-average discount rate	3.20%		3.20%
Undiscounted cash flows			$ 148,000,000
Unrecognized tax benefits	$ 27,000,000		27,000,000
Letters of credit	21,000,000		21,000,000
2022 Notes
Debt Instrument [Line Items]
Principal	96,000,000		96,000,000			$ 782,500,000
2030 Notes
Debt Instrument [Line Items]
Principal	$ 1,500,000,000		$ 1,500,000,000		$ 1,500,000,000
Minimum
Debt Instrument [Line Items]
Operating lease term	4 years		4 years
Maximum
Debt Instrument [Line Items]
Operating lease term	13 years		13 years