Summarized Financial Information of Unconsolidated Affiliate Summarized Balance Sheet of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financial Support for Nonconsolidated Legal Entity [Line Items]
Current Assets of Unconsolidated Affiliates	$ 41	$ 48
Non-current Assets of Unconsolidated Affiliates	7	15
Current Liabilities of Unconsolidated Affiliates	21	20
Non-current Liabilities of Unconsolidated Affiliates	$ 12	$ 11