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Benefit Plans Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Obligations and Funded Status | The changes in plan obligations, assets, and funded status for the years ended September 30, 2015 and 2014, were as follows:
Obligations and Funded Status For the years ended September 30
| Pension Benefits |  | Other Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 12,265 |  |  | $ | 11,471 |  |  | $ | 652 |  |  | $ | 656 |
Service cost | 130 |  |  | 130 |  |  | 16 |  |  | 18 |
Interest cost | 540 |  |  | 558 |  |  | 29 |  |  | 32 |
Plan participants’ contributions | 25 |  |  | 28 |  |  | — |  |  | — |
Collections(1) | — |  |  | — |  |  | 94 |  |  | 93 |
Amendments | — |  |  | 2 |  |  | — |  |  | — |
Actuarial loss (gain) | 556 |  |  | 722 |  |  | 3 |  |  | (21 | )
Net transfers from variable fund/401(k) plan | 11 |  |  | 13 |  |  | — |  |  | — |
Expenses paid | (6 | ) |  | (6 | ) |  | — |  |  | — |
Benefits paid | (697 | ) |  | (653 | ) |  | (137 | ) |  | (126 | )
Benefit obligation at end of year | 12,824 |  |  | 12,265 |  |  | 657 |  |  | 652 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |
Fair value of net plan assets at beginning of year | 7,507 |  |  | 7,221 |  |  | — |  |  | — |
Actual return on plan assets | (325 | ) |  | 648 |  |  | — |  |  | — |
Plan participants’ contributions | 25 |  |  | 28 |  |  | — |  |  | — |
Collections(1) | — |  |  | — |  |  | 94 |  |  | 93 |
Net transfers from variable fund/401(k) plan | 11 |  |  | 13 |  |  | — |  |  | — |
Employer contributions(2) | 282 |  |  | 256 |  |  | 43 |  |  | 33 |
Expenses paid | (6 | ) |  | (6 | ) |  | — |  |  | — |
Benefits paid | (697 | ) |  | (653 | ) |  | (137 | ) |  | (126 | )
Fair value of net plan assets at end of year | 6,797 |  |  | 7,507 |  |  | — |  |  | — |
Funded status | $ | (6,027 | ) |  | $ | (4,758 | ) |  | $ | (657 | ) |  | $ | (652 | )
Notes (1) Collections include retiree contributions as well as federal reinsurance payments and provider discounts and rebates. (2) Other Post-Retirement Benefits Employer contributions are reduced by federal reinsurance payments and provider discounts and rebates.
Amounts Recognized on TVA's Consolidated Balance Sheets | Amounts related to these benefit plans recognized on TVA's consolidated balance sheets consist of regulatory assets that have not been recognized as components of net periodic benefit cost at September 30, 2015 and 2014, and the funded status of TVA’s benefit plans, which are included in Accounts payable and accrued liabilities and Post-retirement and post-employment benefit obligations:
Amounts Recognized on TVA's Consolidated Balance Sheets At September 30
| Pension Benefits |  | Other Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Regulatory assets | $ | 5,425 |  |  | $ | 4,157 |  |  | $ | 140 |  |  | $ | 140 |
Accounts payable and accrued liabilities | (6 | ) |  | (5 | ) |  | (37 | ) |  | (38 | )
Pension and post-retirement benefit obligations(1) | (6,021 | ) |  | (4,753 | ) |  | (620 | ) |  | (614 | )
Note (1) Table above excludes $465 million and $472 million of post-employment benefit costs that are recorded in post-retirement and post-employment benefit obligations on the Consolidated Balance Sheets at September 30, 2015 and 2014, respectively.
Post-Retirement Benefit Costs Deferred as Regulatory Assets | Unrecognized amounts included in regulatory assets yet to be recognized as components of accrued benefit cost at September 30 consisted of:
Post-Retirement Benefit Costs Deferred as Regulatory Assets At September 30
| Pension Benefits |  | Other Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Unrecognized prior service credit | $ | (158 | ) |  | $ | (180 | ) |  | $ | (33 | ) |  | $ | (39 | )
Unrecognized net loss | 5,355 |  |  | 4,337 |  |  | 173 |  |  | 179 |
Amount capitalized due to actions of regulator | 228 |  |  | — |  |  | — |  |  | — |
Total regulatory assets | $ | 5,425 |  |  | $ | 4,157 |  |  | $ | 140 |  |  | $ | 140 |
Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets | The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plan at September 30, 2015, and 2014, were as follows:
Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets At September 30
| 2015 |  | 2014
Projected benefit obligation | $ | 12,824 |  |  | $ | 12,265 |
Accumulated benefit obligation | 12,626 |  |  | 12,039 |
Fair value of net plan assets | 6,797 |  |  | 7,507 |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost and other amounts recognized as changes in regulatory assets for the years ended September 30, 2015, and 2014, were as follows:
Components of Net Periodic Benefit Cost For the years ended September 30
| Pension Benefits |  | Other Post-Retirement Benefits
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Service cost | $ | 130 |  |  | $ | 130 |  |  | $ | 154 |  |  | $ | 16 |  |  | $ | 18 |  |  | $ | 24 |
Interest cost | 540 |  |  | 558 |  |  | 468 |  |  | 29 |  |  | 32 |  |  | 31 |
Expected return on plan assets | (437 | ) |  | (435 | ) |  | (428 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service credit | (21 | ) |  | (21 | ) |  | (22 | ) |  | (6 | ) |  | (6 | ) |  | (6 | )
Recognized net actuarial loss | 299 |  |  | 285 |  |  | 377 |  |  | 9 |  |  | 11 |  |  | 25 |
Total net periodic benefit cost as actuarially determined | 511 |  |  | 517 |  |  | 549 |  |  | 48 |  |  | 55 |  |  | 74 |
Amount capitalized due to actions of regulator | (228 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net period benefit cost | $ | 283 |  |  | $ | 517 |  |  | $ | 549 |  |  | $ | 48 |  |  | $ | 55 |  |  | $ | 74 |
Expected Amortization of Regulatory Assets in Next Fiscal Year | The amounts in the regulatory asset that are expected to be recognized as components of net periodic benefit cost during the next fiscal year are as follows:
Expected Amortization of Regulatory Assets in 2016 At September 30, 2015
| Pension Benefits |  | Other Post-Retirement Benefits |  | Total
Prior service credit | $ | (23 | ) |  | $ | (6 | ) |  | $ | (29 | )
Net actuarial loss | 291 |  |  | 8 |  |  | 299 |
Actuarial Assumptions | TVA’s reported costs of providing the plan benefits are impacted by numerous factors including the provisions of the plans, changing employee demographics, and various assumptions, the most significant of which are noted below.
Actuarial Assumptions At September 30
| Pension Benefits |  | Other Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Assumptions utilized to determine benefit obligations at September 30 |  |  |  |  |  |  |
Discount rate | 4.50 | % |  | 4.45 | % |  | 4.65 | % |  | 4.50 | %
Rate of compensation increase | 5.70 | % |  | 5.70 | % |  | N/A |  |  | N/A |
Initial health care cost trend rate | N/A |  |  | N/A |  |  | 7.00 | % |  | 7.50 | %
Ultimate health care cost trend rate | N/A |  |  | N/A |  |  | 5.00 | % |  | 5.00 | %
Ultimate trend rate is reached in year beginning | N/A |  |  | N/A |  |  | 2019 |  |  | 2019 |
Assumptions utilized to determine net periodic benefit cost for the years ended September 30 |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.45 | % |  | 5.00 | % |  | 4.50 | % |  | 5.05 | %
Expected return on plan assets | 7.00 | % |  | 7.25 | % |  | N/A |  |  | N/A |
Rate of compensation increase | 5.70 | % |  | 5.72 | % |  | N/A |  |  | N/A |
Initial health care cost trend rate | N/A |  |  | N/A |  |  | 7.50 | % |  | 8.00 | %
Ultimate health care cost trend rate | N/A |  |  | N/A |  |  | 5.00 | % |  | 5.00 | %
Ultimate trend rate is reached in year beginning | N/A |  |  | N/A |  |  | 2019 |  |  | 2019 |
Sensitivity to Certain Changes in Pension Assumptions | The following chart reflects the sensitivity of pension cost to changes in certain actuarial assumptions:
Sensitivity to Certain Changes in Pension Assumptions At September 30, 2015
Actuarial Assumption |  | Change in Assumption |  | Impact on 2015 Pension Cost |  | Impact on 2015 Projected Benefit Obligation
Discount rate |  | (0.25 | ) |  | $ | 18 |  |  | $ | 404 |
Rate of return on plan assets |  | (0.25 | ) |  | 16 |  |  | N/A |
Sensitivity to Changes in Assumed Health Care Cost Trend Rates | The following chart reflects the sensitivity of post-retirement benefit cost to changes in the health care trend rate:
Sensitivity to Changes in Assumed Health Care Cost Trend Rates At September 30, 2015
| 1% Increase |  | 1% Decrease
Effect on total of service and interest cost components for the year | $ | 6 |  |  | $ | (6 | )
Effect on end-of-year accumulated post-retirement benefit obligation | 88 |  |  | (94 | )
Asset Holdings and Fair Value Measurements | At September 30, 2015 and 2014, the asset holdings of the system included the following:
Asset Holdings of TVARS At September 30
|  |  |  | Plan Assets at September 30
Asset Category |  | Target Allocation |  | 2015 |  | 2014
Global equity |  | 32 | % |  | 38 | % |  | 43 | %
Private equity |  | 10 | % |  | 5 | % |  | 5 | %
Low volatility global public equity |  | 5 | % |  | 5 | % |  | 1 | %
Cash |  | 2 | % |  | 2 | % |  | 2 | %
Core fixed income |  | 5 | % |  | 5 | % |  | 5 | %
Long-term core fixed income |  | 5 | % |  | 5 | % |  | 5 | %
Investment grade credit |  | 6 | % |  | 6 | % |  | 6 | %
International emerging markets fixed income |  | 5 | % |  | 5 | % |  | 5 | %
High yield fixed income |  | 5 | % |  | 6 | % |  | 6 | %
Global TIPS |  | 5 | % |  | 6 | % |  | 5 | %
Private real assets |  | 10 | % |  | 9 | % |  | 7 | %
Commodities |  | 5 | % |  | 4 | % |  | 4 | %
MLPs |  | 5 | % |  | 4 | % |  | 6 | %
Total |  | 100 | % |  | 100 | % |  | 100 | %
Fair Value Measurements The following table provides the fair value measurement amounts for assets held by TVARS at September 30, 2015:
TVA Retirement System At September 30, 2015
| Total(1) (2) |  | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Equity securities | $ | 1,650 |  |  | $ | 1,649 |  |  | $ | — |  |  | $ | 1 |
Preferred securities | 36 |  |  | 2 |  |  | 34 |  |  | — |
Debt securities |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 1,161 |  |  | — |  |  | 1,149 |  |  | 12 |
Residential mortgage-backed securities | 151 |  |  | — |  |  | 138 |  |  | 13 |
Debt securities issued by U.S. Treasury | 362 |  |  | 362 |  |  | — |  |  | — |
Debt securities issued by foreign governments | 294 |  |  | — |  |  | 281 |  |  | 13 |
Asset-backed securities | 156 |  |  | — |  |  | 116 |  |  | 40 |
Debt securities issued by state/local governments | 25 |  |  | — |  |  | 25 |  |  | — |
Commercial mortgage-backed securities | 43 |  |  | — |  |  | 32 |  |  | 11 |
Commingled Funds measured at net asset value(3) |  |  |  |  |  |  |  |  |  |  |
Equity | 642 |  |  | — |  |  | — |  |  | — |
Debt | 654 |  |  | — |  |  | — |  |  | — |
Commodity | 244 |  |  | — |  |  | — |  |  | — |
Blended | 206 |  |  | — |  |  | — |  |  | — |
Institutional mutual funds | 26 |  |  | 26 |  |  | — |  |  | — |
Cash equivalents and other short-term investments | 318 |  |  | — |  |  | 318 |  |  | — |
Certificates of deposit | 6 |  |  | — |  |  | 6 |  |  | — |
Private equity measured at net asset value(3) | 389 |  |  | — |  |  | — |  |  | — |
Private real estate measured at net asset value(3) | 556 |  |  | — |  |  | — |  |  | — |
Treasury bills, U.S. Government notes, and securities held as futures and other derivative collateral | 34 |  |  | 21 |  |  | 13 |  |  | — |
Securities lending commingled funds | 3 |  |  | — |  |  | 3 |  |  | — |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Purchased options | 2 |  |  | — |  |  | 1 |  |  | 1 |
Foreign currency forward receivable | 6 |  |  | — |  |  | 6 |  |  | — |
Total Assets | $ | 6,964 |  |  | $ | 2,060 |  |  | $ | 2,122 |  |  | $ | 91 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Futures | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |
Foreign currency forward payable | 4 |  |  | — |  |  | 4 |  |  | — |
Written options | 2 |  |  | — |  |  | 2 |  |  | — |
Interest rate swaps | 10 |  |  | — |  |  | 10 |  |  | — |
Credit default swaps | 1 |  |  | — |  |  | 1 |  |  | — |
Total Liabilities | $ | 34 |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |
Notes (1) Excludes approximately $130 million in net payables associated with security purchases and sales and various other payables. (2) Excludes a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs. (3) In accordance with Accounting Standards Codification Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The following table provides the fair value measurement amounts for assets held by TVARS at September 30, 2014:
TVA Retirement System At September 30, 2014
| Total(1) (2) |  | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Equity securities | $ | 1,669 |  |  | $ | 1,668 |  |  | $ | — |  |  | $ | 1 |
Preferred securities | 37 |  |  | 5 |  |  | 32 |  |  | — |
Debt securities |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 1,326 |  |  | — |  |  | 1,304 |  |  | 22 |
Residential mortgage-backed securities | 204 |  |  | — |  |  | 201 |  |  | 3 |
Debt securities issued by U.S. Treasury | 93 |  |  | 93 |  |  | — |  |  | — |
Debt securities issued by foreign governments | 225 |  |  | — |  |  | 218 |  |  | 7 |
Asset-backed securities | 176 |  |  | — |  |  | 147 |  |  | 29 |
Debt securities issued by state/local governments | 30 |  |  | — |  |  | 29 |  |  | 1 |
Commercial mortgage-backed securities | 23 |  |  | — |  |  | 20 |  |  | 3 |
Commingled funds measured at net asset value(3) |  |  |  |  |  |  |  |  |  |  |
Equity | 1,106 |  |  | — |  |  | — |  |  | — |
Debt | 661 |  |  | — |  |  | — |  |  | — |
Commodities | 332 |  |  | — |  |  | — |  |  | — |
Blended | 228 |  |  | — |  |  | — |  |  | — |
Institutional mutual funds | 28 |  |  | 28 |  |  | — |  |  | — |
Cash equivalents and other short-term investments | 464 |  |  | — |  |  | 464 |  |  | — |
Certificates of deposit | 19 |  |  | — |  |  | 19 |  |  | — |
Private equity measured at net asset value(3) | 481 |  |  | — |  |  | — |  |  | — |
Private real estate measured at net asset value(3) | 435 |  |  | — |  |  | — |  |  | — |
Treasury bills, U.S. Government notes, and securities held as futures and other derivative collateral | 35 |  |  | 10 |  |  | 25 |  |  | — |
Securities lending commingled funds | 2 |  |  | — |  |  | 2 |  |  | — |
Derivatives |  |  |  |  |  |  |
Purchased options | 18 |  |  | — |  |  | 18 |  |  | — |
Foreign currency forward receivable | 8 |  |  | — |  |  | 8 |  |  | — |
Total Assets | $ | 7,600 |  |  | $ | 1,804 |  |  | $ | 2,487 |  |  | $ | 66 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Futures | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |
Foreign currency forward payable | 8 |  |  | — |  |  | 8 |  |  | — |
Written options | 7 |  |  | — |  |  | 7 |  |  | — |
Total Liabilities | $ | 26 |  |  | $ | 11 |  |  | $ | 15 |  |  | $ | — |
Notes (1) Excludes approximately $65 million in net payables associated with security purchases and sales and various other payables. (2) Excludes a $2 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs. (3) In accordance with Accounting Standards Codification Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.
Fair Value Measurements Using Significant Unobservable Inputs | The following table provides a reconciliation of beginning and ending balances of pension plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):
Fair Value Measurements Using Significant Unobservable Inputs
| Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at October 1, 2013 | $ | 42 |
Net realized/unrealized gains (losses) | 3 |
Purchases, sales, issuances, and settlements (net) | 26 |
Transfers in and/or out of Level 3 | (5 | )
Balance at September 30, 2014 | 66 |
Net realized/unrealized gains (losses) | (2 | )
Purchases, sales, issuances, and settlements (net) | 33 |
Transfers in and/or out of Level 3 | (6 | )
Balance at September 30, 2015 | $ | 91 |
Estimated Future Benefit Payments | The following table sets forth the estimated future benefit payments under the benefit plans.
Estimated Future Benefits Payments At September 30, 2015
| Pension Benefits |  | Other Post-Retirement Benefits
2016 | $ | 741 |  |  | $ | 39 |
2017 | 744 |  |  | 39 |
2018 | 748 |  |  | 39 |
2019 | 755 |  |  | 39 |
2020 | 764 |  |  | 39 |
2021 - 2025 | 3,903 |  |  | 178 |

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- Definition Schedule of expected amortization amounts in the next fiscal year of pension and postretirement benefit costs deferred as regulatory assets. + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the aggregate benefit obligation and aggregate fair value of plan assets for pension plans and/or other employee benefit plans with benefit obligations in excess of plan assets as of the measurement date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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