Summarized Financial Information of Unconsolidated Affiliate Summarized Balance Sheet of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Financial Support for Nonconsolidated Legal Entity [Line Items]
Non-current Assets of Unconsolidated Affiliates	$ 18	$ 20
Current Assets of Unconsolidated Affiliates	19	20
Current Liabilities of Unconsolidated Affiliates	15	16
Non-current Liabilities of Unconsolidated Affiliates	$ 10	$ 10