Regulatory Matters Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2013

Regulatory Matters [Abstract]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

The following table summarizes our regulatory asset and liability balances (in millions):

	March 31, 2013		December 31, 2012
Current regulatory assets	$	26	$	18
Non-current regulatory assets	203		204
Total Regulatory Assets	$	229	$	222
Current regulatory liabilities	$	4	$	4
Non-current regulatory liabilities	62		65
Total Regulatory Liabilities	$	66	$	69