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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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 506,605 | $ 453,986 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 200,397 | 239,289 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 207,520 | 122,098 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 98,688 | 92,599 |
PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 62,139 | 60,506 |
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 | 444,466 | 393,480 |
PNMR Master Trust [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 | 24,118 | 30,530 |
PNMR Master Trust [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 | 176,279 | 208,759 |
PNMR Master Trust [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 | 23,466 | 16,317 |
PNMR Master Trust [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 | 184,054 | 105,781 |
PNMR Master Trust [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 | 14,555 | 13,659 | 12,426
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 280 | (199) |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | 243 | 1,024 |
Defined Benefit Plan Assets, Purchases | 695 | 8,602 |
Defined Benefit Plan Assets, Sales | (322) | (8,194) |
PNMR Master Trust [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 | 84,133 | 78,940 | 74,105
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 1,624 | (778) |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | 1,404 | 4,015 |
Defined Benefit Plan Assets, Purchases | 4,030 | 33,731 |
Defined Benefit Plan Assets, Sales | (1,865) | (32,133) |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 6,753 | 10,718 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 6,753 | 10,718 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, International Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37,173 | 46,505 |
Equity Securities, International Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37,173 | 46,505 |
Equity Securities, International Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, International Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, Domestic Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 58,350 | 79,218 |
Equity Securities, Domestic Value [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 57,437 | 76,493 |
Equity Securities, Domestic Value [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 913 | 2,725 |
Equity Securities, Domestic Value [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, Domestic Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65,004 | 81,375 |
Equity Securities, Domestic Growth [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65,004 | 81,375 |
Equity Securities, Domestic Growth [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, Domestic Growth [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 49,682 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 49,682 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |
Equity Securities, Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 15,271 | 49,307 |
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 15,271 | 49,307 |
Equity Securities, Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, Corporate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 59,730 | 2,062 |
Fixed Income Securities, Corporate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, Corporate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 59,730 | 2,062 |
Fixed Income Securities, Corporate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, U.S. Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 104,102 | 39,585 |
Fixed Income Securities, U.S. Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 34,030 | 24,198 |
Fixed Income Securities, U.S. Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 70,072 | 15,387 |
Fixed Income Securities, U.S. Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, Municipals [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,478 | 2,935 |
Fixed Income Securities, Municipals [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, Municipals [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,478 | 2,935 |
Fixed Income Securities, Municipals [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fixed Income Securities, Other Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 58,056 |  |
Fixed Income Securities, Other Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  |
Fixed Income Securities, Other Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 58,056 |  |
Fixed Income Securities, Other Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  |
Private Equity Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37,100 | 32,935 |
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37,100 | 32,935 | 26,883
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 1,904 | (769) |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | 2,372 | 2,363 |
Defined Benefit Plan Assets, Purchases | 2,076 | 39,255 |
Defined Benefit Plan Assets, Sales | (2,187) | (34,797) |
Hedge Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,904 | 37,622 |
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,904 | 37,622 | 34,921
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 0 | 0 |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | (718) | 2,701 |
Defined Benefit Plan Assets, Purchases | 0 | 0 |
Defined Benefit Plan Assets, Sales | 0 | 0 |
Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 24,684 | 22,042 |
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 24,684 | 22,042 | 24,727
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 0 | (208) |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | (7) | (25) |
Defined Benefit Plan Assets, Purchases | 2,649 | 3,078 |
Defined Benefit Plan Assets, Sales | 0 | (5,530) |
Real Estate [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 | 2,168
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period |  | (1,846) |
Defined Benefit Plan, Actual Return on Plan Assets Still Held |  | 0 |
Defined Benefit Plan Assets, Purchases |  | 0 |
Defined Benefit Plan Assets, Sales |  | (322) |
Private Equity, Hedge and Real Estate Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 98,688 | 92,599 | 86,531
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 1,904 |  |
Defined Benefit Plan, Actual Return on Plan Assets Still Held | 1,647 | 5,039 |
Defined Benefit Plan Assets, Purchases | 4,725 | 42,333 |
Defined Benefit Plan Assets, Sales | (2,187) | (40,327) |
Private Equity, Hedge and Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period |  | (977) |
Other Postretirement Benefits [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8,303 | 8,596 | 7,093
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period | 8,459 | 8,625 |
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 | 58,776 | 61,749 | 57,126
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period | 59,857 | 62,551 |
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 | 4,163 | 4,550 |
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 | 28,638 | 31,973 |
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 | 4,296 | 4,075 |
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 | 31,219 | 30,578 |
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] | 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] | 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 | 180 | 424 |
Other Postretirement Benefits [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 | 1,128 | 1,811 |
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [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 | 180 | 424 |
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [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 | 1,128 | 1,811 |
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [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] | Cash and Cash Equivalents [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] | 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 | 1,248 | 1,116 |
Other Postretirement Benefits [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 | 2,740 | 3,182 |
Other Postretirement Benefits [Member] | Equity Securities, International Funds [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, International Funds [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, International Funds [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 | 1,248 | 1,116 |
Other Postretirement Benefits [Member] | Equity Securities, International Funds [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 | 2,740 | 3,182 |
Other Postretirement Benefits [Member] | Equity Securities, International Funds [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] | Equity Securities, International Funds [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] | 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 | 582 |
Other Postretirement Benefits [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 | 1,363 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [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 | 551 | 582 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [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 | 1,289 | 1,363 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [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] | Equity Securities, Domestic Value [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] | 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 | 738 | 710 |
Other Postretirement Benefits [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 | 43,016 | 41,278 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [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 | 738 | 710 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [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 | 22,215 | 22,939 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [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 | 20,801 | 18,339 |
Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [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] | Equity Securities, Domestic Growth [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] | Fixed Income Funds [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,694 | 2,834 |
Other Postretirement Benefits [Member] | Fixed Income Funds [Member] | Public Service Company of New Mexico [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,006 | 5,860 |
Other Postretirement Benefits [Member] | Fixed Income Funds [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 | 2,694 | 2,834 |
Other Postretirement Benefits [Member] | Fixed Income Funds [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 | 4,006 | 5,860 |
Other Postretirement Benefits [Member] | Fixed Income Funds [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Fixed Income Funds [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Fixed Income Funds [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] | Fixed Income Funds [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] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,048 | 2,959 |
Other Postretirement Benefits [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 | 7,678 | 9,057 |
Other Postretirement Benefits [Member] | Equity Securities, Other [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, Other [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 | 0 | 0 |
Other Postretirement Benefits [Member] | Equity Securities, Other [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 | 3,048 | 2,959 |
Other Postretirement Benefits [Member] | Equity Securities, Other [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 | 7,678 | 9,057 |
Other Postretirement Benefits [Member] | Equity Securities, Other [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] | Equity Securities, Other [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 |

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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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=6962843&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=6962843&loc=d3e2446-114920 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. + 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 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 3: 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 4: 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 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=6962843&loc=d3e1928-114920 + Details
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