Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	$ 1,215	$ 1,397
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	140	157
Other Significant Noncash Transaction, Value of Consideration Received	11	13
Contract with Customer, Liability, Revenue Recognized	(224)	(352)
Contract with Customer, Liability - End of Period	1,209	1,215
Chesapeake Energy Corporation [Member]
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price	$ 67	$ 0