CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents	$ 200	$ 341
Bad debt reserve	1	1
Accounts and notes receivable, net	333	225
Other	55	66
Regulatory assets	1,663	1,793
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents	200	340
Accounts and notes receivable, net	65	52
Other	31	40
Regulatory assets	$ 1,690	$ 1,919