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Proprietary Capital (Tables) | 12 Months Ended
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Sep. 30, 2021
Stockholders' Equity Note [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated Other Comprehensive Income (Loss) The items included in AOCI consist of market valuation adjustments for certain derivative instruments. See Note 16 — Risk Management Activities and Derivative Transactions. TVA records exchange rate gains and losses on debt and related accrued interest in net income and marks its currency swap assets and liabilities to market through OCI. TVA recognized unrealized gains (losses) of $126 million and $(1) million in 2021 and 2020, respectively, into AOCI on the MtM of currency swaps. TVA then reclassified an amount out of AOCI into net income, offsetting the gain/loss from recording the exchange gain/loss on the debt and related accrued interest. The amounts reclassified from OCI into net income resulted in increases (decreases) to net income of $97 million, $38 million, and $(45) million in 2021, 2020, and 2019, respectively. These reclassifications, coupled with the recording of the exchange gain/loss on the debt and related accrued interest, did not have an impact on net income in 2021, 2020, and 2019. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $25 million of gains from AOCI to interest expense within the next 12 months to offset amounts anticipated to be recorded in interest expense related to exchange gain on the debt and related accrued interest.
Summary of Proprietary Capital Activity | The table below summarizes TVA's activities related to appropriated funds and retained earnings.
Summary of Proprietary Capital Activity At or for the years ended September 30
| 2021 |  | 2020
| Power Program |  | Nonpower Programs |  | Power Program |  | Nonpower Programs
Appropriation Investment | $ | 258 |  |  | $ | 4,351 |  |  | $ | 258 |  |  | $ | 4,351 |
Proprietary Capital |  |  |  |  |  |  |
Balance at beginning of year | 12,177 |  |  | (3,803) |  |  | 10,823 |  |  | (3,795) |
Net income (loss) for year | 1,520 |  |  | (8) |  |  | 1,360 |  |  | (8) |
Return on power program appropriation investment | (4) |  |  | — |  |  | (6) |  |  | — |
Implementation of new accounting standard(1) | (4) |  |  | — |  |  | — |  |  | — |
Balance at end of year | 13,689 |  |  | (3,811) |  |  | 12,177 |  |  | (3,803) |
Net proprietary capital at September 30 | $ | 13,947 |  |  | $ | 540 |  |  | $ | 12,435 |  |  | $ | 548 |

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