CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Balance Sheet Parenthetical - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents	$ 205	$ 264
Allowance for Doubtful Accounts Receivable, Current	1	1
Accounts and notes receivable, net	219	234
Other	52	63
Other Assets:
Regulatory assets	2,133	2,211
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents	205	264
Accounts and notes receivable, net	63	64
Other	39	35
Other Assets:
Regulatory assets	$ 2,279	$ 2,373