CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Cash and cash equivalents ($181 and $230 related to VIEs, respectively)	$ 191	$ 238
Bad debt reserve	1	1
Accounts and notes receivable, net	299	284
Other	62	62
Regulatory assets	1,457	1,570
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents ($181 and $230 related to VIEs, respectively)	181	230
Accounts and notes receivable, net	86	73
Other	37	35
Regulatory assets	$ 1,455	$ 1,590