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Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details) | 1 Months Ended | 6 Months Ended |  |  |  |
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Sep. 30, 2012 operating_unit | Jun. 30, 2022 USD ($) generatingUnit | Dec. 31, 2021 USD ($) | Dec. 01, 2015 Allotment_Parcel | Jul. 13, 2015 a | Jan. 22, 2015 Allotment_Parcel
PNM | Navajo Nation Allottee Matters |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number of landowners involved in the appeal | operating_unit | 43 |  |  |  |  |
Number of allotments where landowners are revoking rights of way renewal consents (in allotment parcels) | Allotment_Parcel |  |  |  | 2 |  | 10
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 |  |
PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Ownership percentage in nuclear reactor |  | 10.20% |  |  |  |
Number of units | generatingUnit |  | 3 |  |  |  |
Maximum potential assessment per incident |  | $ 42,100,000 |  |  |  |
Annual payment limitation related to incident |  | 6,200,000 |  |  |  |
Aggregate amount of all risk insurance |  | 2,800,000,000 |  |  |  |
Maximum amount under Nuclear Electric Insurance Limited |  | 5,400,000 |  |  |  |
PNM | Maximum | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Liability insurance coverage |  | 13,500,000,000 |  |  |  |
Liability insurance coverage sublimit |  | 2,250,000,000 |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  | 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 |  | $ 13,100,000,000 |  |  |  |

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