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

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

Our current and noncurrent regulatory asset and liability balances for the years ended December 31, 2015 and 2014 are as follows:

	December 31,
	2015		2014
	(Millions)
Current assets reported within Other current assets	$	84	$	81
Noncurrent assets reported within Regulatory assets, deferred charges, and other	305		289
Total regulated assets	$	389	$	370
Current liabilities reported within Other accrued liabilities	$	4	$	11
Noncurrent liabilities reported within Regulatory liabilities, deferred income, and other	409		349
Total regulated liabilities	$	413	$	360