Schedule I - Condensed Financial Information Of Parent Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Cash and Cash Equivalents Including Restricted Cash [Line Items]
Cash and cash equivalents	$ 16	$ 16
Restricted cash included in Other current assets	120	74
Cash, cash equivalents, and restricted cash	176	107	$ 68	$ 52
Parent Company
Schedule of Cash and Cash Equivalents Including Restricted Cash [Line Items]
Cash and cash equivalents	0	0
Restricted cash included in Other current assets	3	1
Cash, cash equivalents, and restricted cash	$ 3	$ 1	$ 8	$ 9