Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Contract with Customer, Asset, after Allowance for Credit Loss	$ 8		$ 8		$ 9
Restricted Cash and Cash Equivalents, Current	3		3		4
Allowance for Doubtful Accounts, Premiums and Other Receivables	3		3		$ 3
increase (decrease) in cost of sales		$ (22)		$ (45)
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	528	735	1,208	1,462
Increase (Decrease) in Selling, General and Administrative expense		(4)		(7)
Selling, general and administrative expense (see Note 2)	55	57	130	145
Depreciation and amortization	$ 56	26	$ 114	52
Previously Reported [Member]
Cost of Goods and Services Sold		757		1,507
Previously reported, selling general and administrative expense		$ 61		$ 152