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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
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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