Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 4	$ 3
Percentage of ownership before transaction		15.00%
Settlement payment	$ 7
Loss Contingency Accrual, Payments		$ 0	0	$ 7
Payments to Acquire Productive Assets		162	$ 158	$ 206
Other Commitment		456
Letters of credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount		79
Surety Bonds [Member]
Loss Contingencies [Line Items]
Other Commitment		142
Revolving Credit Facility [Member] | Letters of credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount		$ 235