Leases - Schedule of Lease Cost and Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finance leases:
Amortization of finance lease assets	$ 11	$ 4	$ 26	$ 11
Interest obligations under finance leases	2	1	5	3
Total finance lease costs	13	5	31	14
Operating leases:
Fixed lease costs	14	8	35	21
Total operating lease costs	16	11	40	28
Cash payments related to lease liabilities included in operating cash flows:
Operating lease liabilities			23	12
Interest payments on finance lease liabilities			5	3
Cash payments related to lease liabilities included in financing cash flows:
Principal payments on finance lease liabilities			35	13
Related parties
Operating leases:
Fixed lease costs	1	2	4	6
Variable short-term lease costs to related parties	$ 1	$ 1	1	1
Cash payments related to lease liabilities included in operating cash flows:
Operating lease liabilities			$ 4	$ 6