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Financing - Financing Activities - TNMP (Narrative) (Details) - TNMP | Feb. 14, 2025 USD ($) | Mar. 28, 2024 USD ($) bond | Apr. 28, 2023 USD ($) bond | Apr. 27, 2022 USD ($) bond
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TNMP 2022 Bond Purchase Agreement | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 160,000,000
Series of bond issuance | bond |  |  |  | 2
TNMP 2022 Bond Purchase Agreement at 4.13% Due May 12, 2022 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 65,000,000
Stated percentage (as a percent) |  |  |  | 4.13%
TNMP 2022 Bond Purchase Agreement at 3.81% Due July 28, 2032 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 95,000,000
Stated percentage (as a percent) |  |  |  | 3.81%
TNMP 2023 Bond Purchase Agreement | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 185,000,000 |
Series of bond issuance | bond |  |  | 2 |
TNMP 2023 Bond Purchase Agreement , 5.01%, Due April 28, 2033 | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 130,000,000 |
Stated percentage (as a percent) |  |  | 5.01% |
TNMP 2023 Bond Purchase Agreement At 5.47%, Due July 28, 2053 | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 55,000,000 |
Stated percentage (as a percent) |  |  | 5.47% |
TNMP 2024 Bond Purchase Agreement | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 285,000,000 |  |
Series of bond issuance | bond |  | 4 |  |
TNMP 2024 Bond Purchase Agreement at 5.26% Due March 28, 2029 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 32,000,000 |  |
Stated percentage (as a percent) |  | 5.26% |  |
TNMP 2024 Bond Purchase Agreement at 5.55% Due March 28, 2036 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 85,000,000 |  |
Stated percentage (as a percent) |  | 5.55% |  |
TNMP 2024 Bond Purchase Agreement at 5.65% Due July 01, 2039 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 40,000,000 |  |
Stated percentage (as a percent) |  | 5.65% |  |
TNMP 2024 Bond Purchase Agreement at 5.79% Due July 01, 2054 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 128,000,000 |  |
Stated percentage (as a percent) |  | 5.79% |  |
TNMP FMBs 2024 Bond Purchase Agreement at 4.03% Due July 2024 | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 80,000,000 |  |
Stated percentage (as a percent) |  | 4.03% |  |
TNMP 2025 Bond Purchase Agreement | Senior Unsecured Notes | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 140,000,000 |  |  |
Stated percentage (as a percent) | 5.19% |  |  |
TNMP 2024 Bond Purchase Agreement, 5.26% And 5.55% Bonds | Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Series of bond issuance | bond |  | 2 |  |

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