Revenue Contract Balances (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, after Allowance for Credit Loss	$ 163,000,000		$ 109,000,000
Financing Receivable, Allowance for Credit Loss	12,000,000
Contract with Customer, Liability	137,000,000		$ 117,000,000
Contract with Customer, Liability, Revenue Recognized	11,000,000	$ 7,000,000
Mong Duong Subsidiary [Member]
Financing Receivable, after Allowance for Credit Loss	1,400,000,000
Financing Receivable, Allowance for Credit Loss	$ 33,000,000