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Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details) |  | 1 Months Ended | 3 Months Ended |  |  |  |  |
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Jul. 29, 2022 USD ($) | Sep. 30, 2012 landOwner | Mar. 31, 2023 USD ($) generatingUnit lawsuit | Dec. 31, 2022 USD ($) | Jan. 31, 2023 USD ($) | Dec. 01, 2015 allotment_parcel | Jul. 13, 2015 a | Jan. 22, 2015 allotment_parcel | Apr. 30, 2014 allotment_parcel
PNM |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Payments for legal settlements | $ 19,800,000 |  |  |  |  |  |  |  |
PNM | Navajo Nation Allottee Matters |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of landowners involved in the appeal | landOwner |  | 43 |  |  |  |  |  |  |
Number of allotments where landowners are revoking rights of way renewal consents (in allotment parcels) | allotment_parcel |  |  |  |  |  | 2 |  | 10 | 6
Area of land (in acres) | a |  |  |  |  |  |  | 15.49 |  |
Number of allotment parcels at issue that are not to be condemned | allotment_parcel |  |  |  |  |  | 2 |  |  |
Number of allotment parcels at issue | allotment_parcel |  |  |  |  |  | 5 |  |  |
Payments for legal settlements |  |  |  | $ 1,500,000 |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of units | generatingUnit |  |  | 3 |  |  |  |  |  |
Maximum potential assessment per incident |  |  |  |  | $ 31,200,000 |  |  |  |
Annual payment limitation related to incident |  |  |  |  | 4,700,000 |  |  |  |
Aggregate amount of all risk insurance |  |  | $ 2,800,000,000 |  |  |  |  |  |
Maximum amount under nuclear electric insurance limited |  |  |  |  | $ 5,100,000 |  |  |  |
PNM | Maximum | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  | 13,700,000,000 |  |  |  |  |  |
Liability insurance coverage sublimit |  |  | $ 2,250,000,000 |  |  |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
New claims filed | lawsuit |  |  | 22 |  |  |  |  |  |
Regulatory asset, allowance for credit loss |  |  | $ 800,000 | $ 800,000 |  |  |  |  |
Commercial providers | PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  | 450,000,000 |  |  |  |  |  |
Industry Wide Retrospective Assessment Program | PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  | $ 13,200,000,000 |  |  |  |  |  |

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