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Financing - TNMP 2019 Bonds (Details) - TNMP - Mortgages - USD ($)	Jul. 01, 2019	Mar. 29, 2019	Feb. 26, 2019
First Mortgage Bonds 3.79 Percent Due 2034
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000.0
Stated interest rate		3.79%
First Mortgage Bonds 3.92 Percent Due 2039
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000.0
Stated interest rate		3.92%
First Mortgage Bonds 4.06 Percent Due 2044
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000.0
Stated interest rate		4.06%
TNMP 2019 Bond Purchase Agreement
Debt Instrument [Line Items]
Aggregate principal amount	$ 305,000,000.0	$ 225,000,000.0	$ 305,000,000.0
Stated interest rate			400.00%
First Mortgage Bonds 3.60 Percent Due 2029
Debt Instrument [Line Items]
Aggregate principal amount	$ 80,000,000.0
Stated interest rate	3.60%

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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