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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 |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Private Equity, Hedge and Real Estate Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 93,188 |  | $ 98,688 | $ 92,599
Actual return on assets sold during the period | 2,824 |  |  |
Actual return on assets still held at period end | 2,565 |  | 1,647 |
Purchases | 5,911 |  | 4,725 |
Sales | (16,800) |  | (2,187) |
Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,969,362 |  | 1,873,002 |
Investment in PVNGS lessor notes | 84,198 |  | 108,742 |
Other investments | 6,965 |  | 14,208 |
Defined Benefit Plan, Fair Value of Plan Assets | 583,688 |  | 506,605 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,385,433 |  | 1,294,846 |
Investment in PVNGS lessor notes | 84,198 |  | 108,742 |
Other investments | 494 |  | 3,052 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 418,166 |  | 413,966 |
Other investments | 281 |  | 271 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,404 |  | 6,753 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 39,867 |  | 37,173 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 39,492 |  | 58,350 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 63,888 |  | 65,004 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17,035 |  | 15,271 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 101,936 |  | 59,730 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 148,341 |  | 104,102 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,639 |  | 3,478 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65,898 |  | 58,056 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Private Equity Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 38,212 |  | 37,100 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Hedge Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 31,277 |  | 36,904 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23,699 |  | 24,684 |
Fair Value, Inputs, Level 1 [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 0 | [1] |  |
Investment in PVNGS lessor notes | 0 | [1] |  |
Other investments | 774 | [1] |  |
Defined Benefit Plan, Fair Value of Plan Assets | 231,953 |  | 200,397 |
Fair Value, Inputs, Level 1 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 0 | [1] |  |
Investment in PVNGS lessor notes | 0 | [1] |  |
Other investments | 494 | [1] |  |
Fair Value, Inputs, Level 1 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 0 | [1] |  |
Other investments | 281 | [1] |  |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,404 |  | 6,753 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 39,867 |  | 37,173 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 39,492 |  | 57,437 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 63,888 |  | 65,004 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 78,302 |  | 34,030 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Hedge Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,966,725 | [1] |  |
Investment in PVNGS lessor notes | 0 | [1] |  |
Other investments | 0 | [1] |  |
Defined Benefit Plan, Fair Value of Plan Assets | 258,547 |  | 207,520 |
Fair Value, Inputs, Level 2 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,385,433 | [1] |  |
Investment in PVNGS lessor notes | 0 | [1] |  |
Other investments | 0 | [1] |  |
Fair Value, Inputs, Level 2 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 418,166 | [1] |  |
Other investments | 0 | [1] |  |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 913 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17,035 |  | 15,271 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 101,936 |  | 59,730 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 70,039 |  | 70,072 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,639 |  | 3,478 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65,898 |  | 58,056 |
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 2,637 | [1] |  |
Investment in PVNGS lessor notes | 84,198 | [1] |  |
Other investments | 6,191 | [1] |  |
Defined Benefit Plan, Fair Value of Plan Assets | 93,188 |  | 98,688 |
Fair Value, Inputs, Level 3 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 0 | [1] |  |
Investment in PVNGS lessor notes | 84,198 | [1] |  |
Other investments | 0 | [1] |  |
Fair Value, Inputs, Level 3 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 0 | [1] |  |
Other investments | 0 | [1] |  |
Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 79,017 |  | 84,133 | 78,940
Actual return on assets sold during the period | 2,627 |  | 1,624 |
Actual return on assets still held at period end | 2,386 |  | 1,404 |
Purchases | 5,498 |  | 4,030 |
Sales | (15,627) |  | (1,865) |
Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 14,171 |  | 14,555 | 13,659
Actual return on assets sold during the period | 197 |  | 280 |
Actual return on assets still held at period end | 179 |  | 243 |
Purchases | 413 |  | 695 |
Sales | (1,173) |  | (322) |
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 38,212 |  | 37,100 | 32,935
Actual return on assets sold during the period | 2,966 |  | 1,904 |
Actual return on assets still held at period end | 40 |  | 2,372 |
Purchases | 3,906 |  | 2,076 |
Sales | (5,800) |  | (2,187) |
Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 31,277 |  | 36,904 | 37,622
Actual return on assets sold during the period | (80) |  | 0 |
Actual return on assets still held at period end | 2,453 |  | (718) |
Purchases | 0 |  | 0 |
Sales | (8,000) |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23,699 |  | 24,684 | 22,042
Actual return on assets sold during the period | (62) |  | 0 |
Actual return on assets still held at period end | 72 |  | (7) |
Purchases | 2,005 |  | 2,649 |
Sales | (3,000) |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Private Equity, Hedge and Real Estate Funds [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual return on assets sold during the period |  |  | 1,904 |
Pension Plan [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 518,095 |  | 427,386 | 392,788
Pension Plan [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 66,540 |  | 59,952 | 60,387
Pension Plan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 517,238 |  | 444,466 |
Pension Plan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 66,450 |  | 62,139 |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 205,491 |  | 176,279 |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26,462 |  | 24,118 |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 232,730 |  | 184,054 |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 25,817 |  | 23,466 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 79,017 |  | 84,133 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 14,171 |  | 14,555 |
Other Postretirement Benefits [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 64,464 |  | 58,776 | 61,749
Other Postretirement Benefits [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8,643 |  | 8,303 | 8,596
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period | 65,536 |  | 59,857 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period | 8,760 |  | 8,459 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,976 |  | 1,128 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 42 |  | 180 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,651 |  | 2,740 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,444 |  | 1,248 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 1,289 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 551 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 46,145 |  | 43,016 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,289 |  | 738 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 7,588 |  | 7,678 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,660 |  | 3,048 |
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] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,176 |  | 4,006 |
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,325 |  | 2,694 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 28,663 |  | 28,638 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,656 |  | 4,163 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,976 |  | 1,128 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 42 |  | 180 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 1,289 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 551 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 19,511 |  | 22,215 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,289 |  | 738 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,176 |  | 4,006 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,325 |  | 2,694 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,873 |  | 31,219 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,104 |  | 4,296 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,651 |  | 2,740 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,444 |  | 1,248 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26,634 |  | 20,801 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 7,588 |  | 7,678 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,660 |  | 3,048 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | PNMR [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,672,290 |  | 1,674,013 |
Investment in PVNGS lessor notes | 77,682 |  | 107,094 |
Other investments | 5,599 |  | 12,207 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 1,215,579 |  | 1,215,540 |
Investment in PVNGS lessor notes | 77,682 |  | 107,094 |
Other investments | 494 |  | 2,900 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term debt | 311,589 |  | 310,963 |
Other investments | $ 281 |  | $ 271 |
[1] | GAAP does not require disclosure of the fair value hierarchy information prior to 2012

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- Definition Defined Benefit Plan Assets, Purchases + References No definition available. + Details
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- 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=21915506&loc=d3e1928-114920 Reference 3: 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=21915506&loc=d3e2446-114920 + 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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=21915506&loc=d3e1928-114920 + Details
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- 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
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