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Fair Value of Derivative and Other Financial Instruments, Defined Benefit Plans Disclosure (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Hedge Funds [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Real Estate [Member] PNMR [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Private Equity, Hedge and Real Estate Funds [Member] PNMR [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity, Hedge and Real Estate Funds [Member] PNMR [Member] | Dec. 31, 2013 Pension Plan [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Pension Plan [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Pension Plan [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Pension Plan [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Pension Plan [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Pension Plan [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] PNMR [Member] | Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] PNMR [Member] | Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,905,230 | $ 1,969,362 | $ 1,382,938 | $ 1,385,433 | $ 390,814 | $ 418,166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,905,230 | $ 1,966,725 | $ 1,382,938 | $ 1,385,433 | $ 390,814 | $ 418,166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 2,637 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,745,420 | $ 1,672,290 | $ 1,290,618 | $ 1,215,579 | $ 336,036 | $ 311,589
Investment in PVNGS lessor notes | 57,279 | 84,198 | 57,279 | 84,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,279 | 84,198 | 57,279 | 84,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,958 | 77,682 | 52,958 | 77,682 |  |
Other investments | 3,196 | 6,965 | 445 | 494 | 245 | 281 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 690 | 774 | 445 | 494 | 245 | 281 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,506 | 6,191 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,835 | 5,599 | 445 | 494 | 245 | 281
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,133 | 65,536 | 9,734 | 8,760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 623,543 | 583,688 |  |  |  |  | 16,281 | 10,404 | 24,471 | 39,867 | 41,451 | 39,492 | 36,805 | 63,888 | 22,522 | 17,035 | 202,897 | 101,936 | 99,748 | 148,341 | 17,259 | 3,639 | 66,286 | 65,898 | 39,122 | 38,212 | 34,912 | 31,277 | 21,789 | 23,699 | 164,021 | 231,953 |  |  |  |  | 16,281 | 10,404 | 24,471 | 39,867 | 41,451 | 39,492 | 36,805 | 63,888 | 0 | 0 | 363 | 0 | 44,541 | 78,302 | 0 | 0 | 109 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 363,523 | 258,547 |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 22,522 | 17,035 | 202,358 | 101,936 | 55,207 | 70,039 | 17,259 | 3,639 | 66,177 | 65,898 | 0 | 0 | 0 | 0 | 0 | 0 | 95,999 | 93,188 |  |  |  |  | 79,017 | 84,133 | 14,171 | 14,555 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38,212 | 37,100 | 31,277 | 36,904 | 23,699 | 24,684 | 93,188 | 98,688 | 556,353 | 518,095 | 427,386 | 66,118 | 66,540 | 59,952 | 557,258 | 517,238 | 66,285 | 66,450 | 145,364 | 205,491 | 18,657 | 26,462 | 330,903 | 232,730 | 32,620 | 25,817 | 80,991 | 79,017 | 15,008 | 14,171 | 73,565 | 64,464 | 58,776 | 9,601 | 8,643 | 8,303 | 6,388 | 381 |  |  |  |  | 1,152 | 4,976 | 302 | 42 | 3,057 | 2,651 | 1,334 | 1,444 | 54,851 | 46,145 | 1,848 | 1,289 | 5,564 | 7,588 | 4,167 | 3,660 | 3,121 | 4,176 | 1,702 | 2,325 | 31,430 | 28,663 | 4,233 | 3,656 | 1,152 | 4,976 | 302 | 42 | 0 | 0 | 0 | 0 | 6,388 | 381 | 20,769 | 19,511 | 1,848 | 1,289 | 0 | 0 | 0 | 0 | 3,121 | 4,176 | 1,702 | 2,325 | 42,703 | 36,873 | 5,501 | 5,104 | 0 | 0 | 0 | 0 | 3,057 | 2,651 | 1,334 | 1,444 | 0 | 0 | 34,082 | 26,634 | 0 | 0 | 5,564 | 7,588 | 4,167 | 3,660 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |
Actual return on assets sold during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,303 | 2,627 | 1,400 | 197 |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | 4,677 | 2,966 | 135 | (80) | (109) | (62) | 4,703 | 2,824 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual return on assets still held at period end |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,361 | 2,386 | 1,425 | 179 |  |  |  |  |  |  |  |  |  |  | 1 | 0 |  |  |  |  |  |  | 1,162 | 40 | 3,500 | 2,453 | 123 | 72 | 4,786 | 2,565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,110 | 5,498 | 6,408 | 413 |  |  |  |  |  |  |  |  |  |  | 175 | 0 |  |  |  |  |  |  | 3,117 | 3,906 | 16,151 | 0 | 2,076 | 2,005 | 21,519 | 5,911 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,800) | 15,627 | (8,396) | 1,173 |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | (8,046) | (5,800) | (16,151) | (8,000) | (4,000) | (3,000) | (28,197) | (16,800) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at end of year | $ 623,543 | $ 583,688 |  |  |  |  | $ 16,281 | $ 10,404 | $ 24,471 | $ 39,867 | $ 41,451 | $ 39,492 | $ 36,805 | $ 63,888 | $ 22,522 | $ 17,035 | $ 202,897 | $ 101,936 | $ 99,748 | $ 148,341 | $ 17,259 | $ 3,639 | $ 66,286 | $ 65,898 | $ 39,122 | $ 38,212 | $ 34,912 | $ 31,277 | $ 21,789 | $ 23,699 | $ 164,021 | $ 231,953 |  |  |  |  | $ 16,281 | $ 10,404 | $ 24,471 | $ 39,867 | $ 41,451 | $ 39,492 | $ 36,805 | $ 63,888 | $ 0 | $ 0 | $ 363 | $ 0 | $ 44,541 | $ 78,302 | $ 0 | $ 0 | $ 109 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 363,523 | $ 258,547 |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 22,522 | $ 17,035 | $ 202,358 | $ 101,936 | $ 55,207 | $ 70,039 | $ 17,259 | $ 3,639 | $ 66,177 | $ 65,898 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 95,999 | $ 93,188 |  |  |  |  | $ 80,991 | $ 79,017 | $ 15,008 | $ 14,171 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 176 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 39,122 | $ 38,212 | $ 34,912 | $ 31,277 | $ 21,789 | $ 23,699 | $ 95,999 | $ 93,188 | $ 556,353 | $ 518,095 | $ 427,386 | $ 66,118 | $ 66,540 | $ 59,952 | $ 557,258 | $ 517,238 | $ 66,285 | $ 66,450 | $ 145,364 | $ 205,491 | $ 18,657 | $ 26,462 | $ 330,903 | $ 232,730 | $ 32,620 | $ 25,817 | $ 80,991 | $ 79,017 | $ 15,008 | $ 14,171 | $ 73,565 | $ 64,464 | $ 58,776 | $ 9,601 | $ 8,643 | $ 8,303 | $ 6,388 | $ 381 |  |  |  |  | $ 1,152 | $ 4,976 | $ 302 | $ 42 | $ 3,057 | $ 2,651 | $ 1,334 | $ 1,444 | $ 54,851 | $ 46,145 | $ 1,848 | $ 1,289 | $ 5,564 | $ 7,588 | $ 4,167 | $ 3,660 | $ 3,121 | $ 4,176 | $ 1,702 | $ 2,325 | $ 31,430 | $ 28,663 | $ 4,233 | $ 3,656 | $ 1,152 | $ 4,976 | $ 302 | $ 42 | $ 0 | $ 0 | $ 0 | $ 0 | $ 6,388 | $ 381 | $ 20,769 | $ 19,511 | $ 1,848 | $ 1,289 | $ 0 | $ 0 | $ 0 | $ 0 | $ 3,121 | $ 4,176 | $ 1,702 | $ 2,325 | $ 42,703 | $ 36,873 | $ 5,501 | $ 5,104 | $ 0 | $ 0 | $ 0 | $ 0 | $ 3,057 | $ 2,651 | $ 1,334 | $ 1,444 | $ 0 | $ 0 | $ 34,082 | $ 26,634 | $ 0 | $ 0 | $ 5,564 | $ 7,588 | $ 4,167 | $ 3,660 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |

X
- Definition Defined Benefit Plan Assets, Purchases + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Benefit Plan Assets, Sales + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Investment In Lessor Notes, Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | pnm_
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Period Type: | instant

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- Definition Other Investments Fair Value Disclosure + References No definition available. + Details
Name: | pnm_OtherInvestmentsFairValueDisclosure
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant