Balance Sheet Parenthetical - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents	$ 251	$ 264
Bad debt reserve	1	1
Accounts and notes receivable, net	297	234
Other	47	63
Regulatory assets	2,020	2,211
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents	246	264
Accounts and notes receivable, net	92	64
Other	37	35
Regulatory assets	$ 2,156	$ 2,373