Rate And Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2011

Rate And Regulatory Matters [Abstract]

Schedule Of Regulatory Assets And Liabilities

Regulatory Assets and Liabilities	Regulatory Asset (Liability) Balance at July 31, 2011 (a)			Recovery Period Ends
Demand-side costs(b)	$	33			July 2017
Construction accounting for pollution control equipment(b)		25			Sept. 2033
SO2 emissions allowances sales tracker(c)		8			July 2013
FERC-ordered MISO resettlements(c)		2			July 2013
2006 Storm costs(c)		1			July 2013
Vegetation management and infrastructure inspection(c)		(3	)		July 2013
Pension and postretirement benefit cost tracker for 2010 costs(b)		(11	)		July 2016
Total	$	55

(a) Represents amounts capitalized at implementation of the rate order at July 31, 2011, and excludes the impact of subsequent amortization of the regulatory assets or liabilities.

(b) Recovery period first established in the MoPSC's July 2011 rate order.

(c) Previous recovery period was extended.