Revenue Recognition - Revenues from Contracts with Customers Disaggregated by Product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 3,670	$ 1,405	$ 1,985
Natural gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	2,798	1,405	1,985
Oil
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	616	0	0
Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 13	$ 0	$ 0