Goodwill And Identifiable Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table provides information regarding our goodwill balance, which arose in connection with accounting for the Merger. There were no changes to the goodwill balance for the three and nine months ended September 30, 2013. None of the goodwill is being deducted for tax purposes.

Goodwill before impairment charges	$	18,322
Accumulated impairment charges	(13,370		)
Balance at September 30, 2013 and December 31, 2012	$	4,952

Schedule of identifiable intangible assets reported in the balance sheet

Identifiable intangible assets, including amounts that arose in connection with accounting for the Merger, are comprised of the following:

	September 30, 2013						December 31, 2012
Identifiable Intangible Asset	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Retail customer relationship	$	463	$	396	$	67	$	463	$	378	$	85
Favorable purchase and sales contracts	551		333		218		552		314		238
Software and other computer-related assets	348		145		203		320		112		208
Environmental allowances and credits	598		407		191		594		393		201
Mining development costs	196		105		91		163		82		81
Total identifiable intangible assets subject to amortization	$	2,156	$	1,386	770		$	2,092	$	1,279	813
Retail trade name (not subject to amortization)					955						955
Mineral interests (not currently subject to amortization)					11						13
Total identifiable intangible assets					$	1,736					$	1,781

Schedule of amortization expense related to intangible assets (including income statement line item)

Amortization expense related to identifiable intangible assets (including income statement line item) consisted of:

Identifiable Intangible Asset	Income Statement Line	Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
Retail customer relationship	Depreciation and amortization	$	6	$	8	$	18	$	25
Favorable purchase and sales contracts	Operating revenues/fuel, purchased power costs and delivery fees	6		5		19		20
Software and other computer-related assets	Depreciation and amortization	14		9		33		24
Environmental allowances and credits	Fuel, purchased power costs and delivery fees	5		6		11		15
Mining development costs	Depreciation and amortization	8		7		23		20
Total amortization expense		$	39	$	35	$	104	$	104

Schedule of estimated aggregate amortization expense of intangible assets for each of the next five fiscal years

The estimated aggregate amortization expense of identifiable intangible assets for each of the next five fiscal years is as follows:

Year	Estimated Amortization Expense
2013	$	143
2014	$	138
2015	$	126
2016	$	101
2017	$	78