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Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

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 September 30, 2016
	West				Texas				East				Consolidation and Elimination				Total
Revenues from external customers	$	524			$	1,067			$	764			$	—			$	2,355
Intersegment revenues	1				3				2				(6		)		—
Total operating revenues	$	525			$	1,070			$	766			$	(6	)		$	2,355
Commodity Margin	$	298			$	198			$	324			$	—			$	820
Add: Mark-to-market commodity activity, net and other⁽¹⁾	11				110				(51		)		(7		)		63
Less:
Plant operating expense	79				65				78				(7		)		215
Depreciation and amortization expense	56				53				52				—				161
Sales, general and other administrative expense	9				13				12				(1		)		33
Other operating expenses	8				2				7				1				18
(Income) from unconsolidated investments in power plants	—				—				(6		)		—				(6		)
Income from operations	157				175				130				—				462
Interest expense, net of interest income																	157
Other (income) expense, net																	8
Income before income taxes																	$	297



	Three Months Ended September 30, 2015
	West				Texas				East				Consolidation and Elimination				Total
Revenues from external customers	$	736			$	709			$	503			$	—			$	1,948
Intersegment revenues	1				4				3				(8		)		—
Total operating revenues	$	737			$	713			$	506			$	(8	)		$	1,948
Commodity Margin	$	385			$	264			$	325			$	—			$	974
Add: Mark-to-market commodity activity, net and other⁽¹⁾	68				(98		)		(62		)		(7		)		(99		)
Less:
Plant operating expense	87				62				57				(6		)		200
Depreciation and amortization expense	61				58				48				(1		)		166
Sales, general and other administrative expense	7				15				10				1				33
Other operating expenses	8				2				8				(2		)		16
(Income) from unconsolidated investments in power plants	—				—				(6		)		—				(6		)
Income from operations	290				29				146				1				466
Interest expense, net of interest income																	158
Other (income) expense, net																	1
Income before income taxes																	$	307



	Nine Months Ended September 30, 2016
	West				Texas				East				Consolidation and Elimination				Total
Revenues from external customers	$	1,159			$	2,129			$	1,846			$	—			$	5,134
Intersegment revenues	4				10				9				(23		)		—
Total operating revenues	$	1,163			$	2,139			$	1,855			$	(23	)		$	5,134
Commodity Margin	$	749			$	511			$	797			$	—			$	2,057
Add: Mark-to-market commodity activity, net and other⁽²⁾	(5		)		7				(44		)		(21		)		(63		)
Less:
Plant operating expense	268				236				258				(21		)		741
Depreciation and amortization expense	181				159				163				—				503
Sales, general and other administrative expense	27				43				36				—				106
Other operating expenses	23				6				27				(1		)		55
(Income) from unconsolidated investments in power plants	—				—				(16		)		—				(16		)
Income from operations	245				74				285				1				605
Interest expense, net of interest income																	469
Debt extinguishment costs and other (income) expense, net																	36
Income before income taxes																	$	100



	Nine Months Ended September 30, 2015
	West				Texas				East				Consolidation and Elimination				Total
Revenues from external customers	$	1,672			$	1,860			$	1,504			$	—			$	5,036
Intersegment revenues	3				12				7				(22		)		—
Total operating revenues	$	1,675			$	1,872			$	1,511			$	(22	)		$	5,036
Commodity Margin	$	843			$	583			$	740			$	—			$	2,166
Add: Mark-to-market commodity activity, net and other⁽²⁾	173				(47		)		(84		)		(21		)		21
Less:
Plant operating expense	313				233				206				(20		)		732
Depreciation and amortization expense	193				157				135				(1		)		484
Sales, general and other administrative expense	23				47				29				1				100
Other operating expenses	28				6				24				(2		)		56
(Income) from unconsolidated investments in power plants	—				—				(18		)		—				(18		)
Income from operations	459				93				280				1				833
Interest expense, net of interest income																	468
Debt modification and extinguishment costs and other (income) expense, net																	40
Income before income taxes																	$	325

_________


(1)	Includes $40 million and $41 million of lease levelization and $25 million and $4 million of amortization expense for the three months ended September 30, 2016 and 2015, respectively.


(2)	Includes $(2) million and $(1) million of lease levelization and $79 million and $11 million of amortization expense for the nine months ended September 30, 2016 and 2015, respectively.