CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents	$ 245	$ 341
Bad debt reserve	1	1
Accounts and notes receivable, net	279	225
Other	52	66
Regulatory assets	1,689	1,793
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents	245	340
Accounts and notes receivable, net	58	52
Other	31	40
Regulatory assets	$ 1,786	$ 1,919