CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents ($230 and $340 related to VIEs, respectively)	$ 238	$ 341
Allowance for Doubtful Accounts Receivable, Current	1	1
Accounts and notes receivable, net ($73 and $52 related to VIEs, respectively), less bad debt reserve of $1 and $1, respectively	284	225
Other ($35 and $40 related to VIEs, respectively)	62	66
Regulatory assets ($1,590 and $1,919 related to VIEs, respectively)	1,570	1,793
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents ($230 and $340 related to VIEs, respectively)	230	340
Accounts and notes receivable, net ($73 and $52 related to VIEs, respectively), less bad debt reserve of $1 and $1, respectively	73	52
Other ($35 and $40 related to VIEs, respectively)	35	40
Regulatory assets ($1,590 and $1,919 related to VIEs, respectively)	$ 1,590	$ 1,919