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



	Year Ended December 31, 2016
	West			Texas			East			Consolidation and Elimination			Total
Revenues from external customers	$	1,562		$	2,801		$	2,353		$	—		$	6,716
Intersegment revenues	7			14			11			(32		)	—
Total operating revenues	$	1,569		$	2,815		$	2,364		$	(32	)	$	6,716
Commodity Margin	$	991		$	655		$	958		$	—		$	2,604
Add: Mark-to-market commodity activity, net and other⁽¹⁾	(3		)	(23		)	(20		)	(29		)	(75		)
Less:
Plant operating expense	357			317			332			(29		)	977
Depreciation and amortization expense	225			213			224			—			662
Sales, general and other administrative expense	39			56			45			—			140
Other operating expenses	32			9			38			—			79
Impairment losses	13			—			—			—			13
(Gain) on sale of assets, net	—			—			(157		)	—			(157		)
(Income) from unconsolidated subsidiaries	—			—			(24		)	—			(24		)
Income from operations	322			37			480			—			839
Interest expense													631
Debt modification and extinguishment costs and other (income) expense, net													49
Income before income taxes													$	159



	Year Ended December 31, 2015
	West		Texas			East			Consolidation and Elimination			Total
Revenues from external customers	$	2,089	$	2,344		$	2,039		$	—		$	6,472
Intersegment revenues	5		15			8			(28		)	—
Total operating revenues	$	2,094	$	2,359		$	2,047		$	(28	)	$	6,472
Commodity Margin	$	1,106	$	736		$	944		$	—		$	2,786
Add: Mark-to-market commodity activity, net and other⁽¹⁾	160		(120		)	(92		)	(29		)	(81		)
Less:
Plant operating expense	416		338			292			(28		)	1,018
Depreciation and amortization expense	250		204			184			—			638
Sales, general and other administrative expense	35		63			40			—			138
Other operating expenses	37		9			36			(2		)	80
(Income) from unconsolidated subsidiaries	—		—			(24		)	—			(24		)
Income from operations	528		2			324			1			855
Interest expense												628
Debt modification and extinguishment costs and other (income) expense, net												54
Income before income taxes												$	173



	Year Ended December 31, 2014
	West		Texas		East			Consolidation and Elimination			Total
Revenues from external customers	$	2,352	$	3,229	$	2,449		$	—		$	8,030
Intersegment revenues	6		23		47			(76		)	—
Total operating revenues	$	2,358	$	3,252	$	2,496		$	(76	)	$	8,030
Commodity Margin⁽²⁾	$	1,050	$	760	$	949		$	—		$	2,759
Add: Mark-to-market commodity activity, net and other⁽¹⁾	220		142		48			(31		)	379
Less:
Plant operating expense	385		313		302			(31		)	969
Depreciation and amortization expense	245		191		168			(1		)	603
Sales, general and other administrative expense	41		64		39			—			144
Other operating expenses	50		5		32			1			88
Impairment losses	—		—		123			—			123
(Gain) on sale of assets, net	—		—		(753		)	—			(753		)
(Income) from unconsolidated subsidiaries	—		—		(25		)	—			(25		)
Income from operations	549		329		1,111			—			1,989
Interest expense											645
Debt extinguishment costs and other (income) expense, net											361
Income before income taxes											$	983

__________


(1)	Includes $(2) million, $(2) million and $(5) million of lease levelization and $122 million, $20 million and $14 million of amortization expense for the years ended December 31, 2016, 2015 and 2014, respectively.


(2)	Our East segment includes Commodity Margin of $81 million for the year ended December 31, 2014 related to the six power plants in our East segment that were sold in July 2014.