General, Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Our current and noncurrent regulatory asset and liability balances for the years ended December 31, 2017 and 2016 are as follows:

	December 31,
	2017		2016
	(Millions)
Current assets reported within Other current assets and deferred charges	$	102	$	91
Noncurrent assets reported within Regulatory assets, deferred charges, and other	376		387
Total regulated assets	$	478	$	478
Current liabilities reported within Accrued liabilities	$	18	$	11
Noncurrent liabilities reported within Regulatory liabilities, deferred income, and other	1,250		498
Total regulated liabilities	$	1,268	$	509