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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Balance at Beginning of Period	$ 6,207tve_Balance	$ 5,574tve_Balance	$ 6,104tve_Balance	$ 5,647tve_Balance
Net income (loss)	496us-gaap_NetIncomeLoss	295us-gaap_NetIncomeLoss	577us-gaap_NetIncomeLoss	228us-gaap_NetIncomeLoss
Total other comprehensive income (loss)	(13)	(5)	10	(7)
Return on power program appropriation investment	(3)tve_ReturnOnAppropriationInvestment	(1)tve_ReturnOnAppropriationInvestment	(4)tve_ReturnOnAppropriationInvestment	(2)tve_ReturnOnAppropriationInvestment
Return of power program appropriation investment		(2)tve_ReturnOfAppropriationInvestment		(5)tve_ReturnOfAppropriationInvestment
Balance at End of Period	6,687tve_Balance	5,861tve_Balance	6,687tve_Balance	5,861tve_Balance
Power Program Appropriation Investment
Balance at Beginning of Period	258	265	258	268
Net income (loss)	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	0	0	0	0
Return of power program appropriation investment		(2)		(5)
Balance at End of Period	258	263	258	263
Power Program Retained Earnings
Balance at Beginning of Period	5,323	4,701	5,240	4,767
Net income (loss)	499	297	583	232
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	(3)	(1)	(4)	(2)
Return of power program appropriation investment		0		0
Balance at End of Period	5,819	4,997	5,819	4,997
Nonpower Programs Appropriation Investment, Net
Balance at Beginning of Period	598	607	601	609
Net income (loss)	(3)	(2)	(6)	(4)
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	0	0	0	0
Return of power program appropriation investment		0		0
Balance at End of Period	595	605	595	605
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges
Balance at Beginning of Period	28	1	5	3
Net income (loss)	0	0	0	0
Total other comprehensive income (loss)	(13)	(5)	10	(7)
Return on power program appropriation investment	0	0	0	0
Return of power program appropriation investment		0		0
Balance at End of Period	$ 15	$ (4)	$ 15	$ (4)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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