Summarized Financial Information of Unconsolidated Affiliate Summarized Balance Sheet of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial Support for Nonconsolidated Legal Entity [Line Items]
Current assets	$ 7	$ 9
Non-current assets	1	1
Current liabilities	2	11
Non-current liabilities	6	12
Unconsolidated JV [Member]
Financial Support for Nonconsolidated Legal Entity [Line Items]
Current assets	38	32
Non-current assets	7	6
Current liabilities	20	10
Non-current liabilities	$ 0	$ 0