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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 | $ 6,207 tve_Balance | $ 5,574 tve_Balance | $ 6,104 tve_Balance | $ 5,647 tve_Balance
Net income (loss) | 496 us-gaap_NetIncomeLoss | 295 us-gaap_NetIncomeLoss | 577 us-gaap_NetIncomeLoss | 228 us-gaap_NetIncomeLoss
Total other comprehensive income (loss) | (13)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 10 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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 | 6,687 tve_Balance | 5,861 tve_Balance | 6,687 tve_Balance | 5,861 tve_Balance
Power Program Appropriation Investment |  |  |  |
Balance at Beginning of Period | 258 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 265 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 258 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 268 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Net income (loss) | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Total other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Return on power program appropriation investment | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Return of power program appropriation investment |  | (2)tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember |  | (5)tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Balance at End of Period | 258 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 263 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 258 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember | 263 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramAppropriationInvestmentMember
Power Program Retained Earnings |  |  |  |
Balance at Beginning of Period | 5,323 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 4,701 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 5,240 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 4,767 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Net income (loss) | 499 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 297 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 583 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 232 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Total other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Return on power program appropriation investment | (3)tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | (1)tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | (4)tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | (2)tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Return of power program appropriation investment |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Balance at End of Period | 5,819 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 4,997 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 5,819 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember | 4,997 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_PowerProgramRetainedEarningsMember
Nonpower Programs Appropriation Investment, Net |  |  |  |
Balance at Beginning of Period | 598 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 607 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 601 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 609 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Net income (loss) | (3)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | (2)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | (6)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | (4)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Total other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Return on power program appropriation investment | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Return of power program appropriation investment |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Balance at End of Period | 595 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 605 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 595 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember | 605 tve_Balance / us-gaap_StatementEquityComponentsAxis = tve_NonpowerProgramsAppropriationInvestmentNetMember
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges |  |  |  |
Balance at Beginning of Period | 28 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 5 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income (loss) | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Total other comprehensive income (loss) | (13)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 10 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Return on power program appropriation investment | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 tve_ReturnOnAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Return of power program appropriation investment |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 0 tve_ReturnOfAppropriationInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at End of Period | $ 15 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (4)tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 15 tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (4)tve_Balance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember

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