Segment and Significant Customer Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of Financial Data for Segments

The tables below show our financial data for our segments for the periods indicated (in millions).

	Three Months Ended March 31, 2014
	West		Texas			North			Southeast		Consolidation and Elimination			Total
Revenues from external customers	$	491	$	647		$	639		$	188	$	—		$	1,965
Intersegment revenues	2		12			15			81		(110		)	—
Total operating revenues	$	493	$	659		$	654		$	269	$	(110	)	$	1,965
Commodity Margin	$	202	$	121		$	267		$	55	$	—		$	645
Add: Unrealized mark-to-market commodity activity, net and other(1)	29		(46		)	(17		)	6		(9		)	(37		)
Less:
Plant operating expense	105		90			52			27		(9		)	265
Depreciation and amortization expense	60		42			33			18		—			153
Sales, general and other administrative expense	10		12			6			6		(1		)	33
Other operating expenses	12		2			6			1		1			22
(Income) from unconsolidated investments in power plants	—		—			(9		)	—		—			(9		)
Income (loss) from operations	44		(71		)	162			9		—			144
Interest expense, net of interest income														165
Other (income) expense, net														11
Loss before income taxes														$	(32	)

	Three Months Ended March 31, 2013
	West			Texas			North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	383		$	407		$	306		$	145		$	—		$	1,241
Intersegment revenues	1			7			7			33			(48		)	—
Total operating revenues	$	384		$	414		$	313		$	178		$	(48	)	$	1,241
Commodity Margin	$	202		$	76		$	142		$	41		$	—		$	461
Add: Unrealized mark-to-market commodity activity, net and other(1)	(37		)	(11		)	7			7			(7		)	(41		)
Less:
Plant operating expense	95			65			43			31			(7		)	227
Depreciation and amortization expense	53			42			33			19			(1		)	146
Sales, general and other administrative expense	7			14			6			6			—			33
Other operating expenses	9			1			7			1			—			18
(Income) from unconsolidated investments in power plants	—			—			(8		)	—			—			(8		)
Income (loss) from operations	1			(57		)	68			(9		)	1			4
Interest expense, net of interest income																174
Other (income) expense, net																5
Loss before income taxes																$	(175	)

_________

(1) Includes $(29) million and $(16) million of lease levelization and $4 million and $4 million of amortization expense for the three months ended March 31, 2014 and 2013, respectively.