Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 3	$ 16
Sale of Stock, Percentage of Ownership before Transaction	15.00%
Loss Contingency Accrual, Payments	$ 0	7	$ 0
Payments to Acquire Productive Assets	158	$ 206	$ 277
Other Commitment	405
Letters of credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	40
Surety Bonds [Member]
Loss Contingencies [Line Items]
Other Commitment	137
Revolving Credit Facility [Member] | Letters of credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	$ 228