Balance Sheet Parenthetical - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents	$ 240	$ 341
Bad debt reserve	1	1
Accounts and notes receivable, net	218	225
Other	59	66
Regulatory assets	1,743	1,793
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents	240	340
Accounts and notes receivable, net	44	52
Other	35	40
Regulatory assets	$ 1,863	$ 1,919