XML 160 R56.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | Jan. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | $ 1,752,594 | $ 1,761,448 | $ 1,744,872 |  |
Cumulative effect adjustment |  |  |  | $ 0 | $ 10,382
Balance at January 1, 2018, as adjusted |  |  |  | 1,761,448 | 1,755,254
Total Other Comprehensive Income (Loss) | 9,307 | (1,536) | 14,097 |  |
Reclassification of stranded income taxes to retained earnings |  |  | 17,600 |  |
Ending Balance | 1,741,750 | 1,752,594 | 1,761,448 |  |
Public Service Company of New Mexico |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | 1,461,571 | 1,488,369 | 1,466,792 |  |
Cumulative effect adjustment |  |  |  | 0 |
Balance at January 1, 2018, as adjusted |  |  |  | 1,488,369 |
Total Other Comprehensive Income (Loss) | 11,367 | (2,121) | 13,129 |  |
Ending Balance | 1,512,431 | 1,461,571 | 1,488,369 |  |
Total |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (108,684) | (95,940) | (92,451) |  |
Cumulative effect adjustment |  |  |  | (11,208) |
Balance at January 1, 2018, as adjusted |  |  |  | (107,148) | $ (92,451)
Amounts reclassified from AOCI (pre-tax) | (5,926) | 3,965 | (10,534) |  |
Income tax impact of amounts reclassified | 1,506 | (1,008) | 4,087 |  |
Other OCI changes (pre-tax) | 18,400 | (6,022) | 32,778 |  |
Income tax impact of other OCI changes | (4,673) | 1,529 | (12,234) |  |
Total Other Comprehensive Income (Loss) | 9,307 | (1,536) | 14,097 |  |
Reclassification of stranded income taxes to retained earnings |  |  | (17,586) |  |
Ending Balance | (99,377) | (108,684) | (95,940) |  |
Total | Public Service Company of New Mexico |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (110,422) | (97,093) | (92,428) |  |
Cumulative effect adjustment |  |  |  | (11,208) |
Balance at January 1, 2018, as adjusted |  |  |  | (108,301) |
Amounts reclassified from AOCI (pre-tax) | (6,659) | 3,749 | (11,115) |  |
Income tax impact of amounts reclassified | 1,692 | (952) | 4,312 |  |
Other OCI changes (pre-tax) | 21,895 | (6,592) | 31,778 |  |
Income tax impact of other OCI changes | (5,561) | 1,674 | (11,846) |  |
Total Other Comprehensive Income (Loss) | 11,367 | (2,121) | 13,129 |  |
Reclassification of stranded income taxes to retained earnings |  |  | (17,794) |  |
Ending Balance | (99,055) | (110,422) | (97,093) |  |
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | 1,939 | 13,169 | 4,320 |  |
Cumulative effect adjustment |  |  |  | (11,208) |
Balance at January 1, 2018, as adjusted |  |  |  | 1,961 |
Amounts reclassified from AOCI (pre-tax) | (14,063) | (3,819) | (17,567) |  |
Income tax impact of amounts reclassified | 3,572 | 970 | 6,816 |  |
Other OCI changes (pre-tax) | 25,724 | 3,790 | 28,160 |  |
Income tax impact of other OCI changes | (6,534) | (963) | (10,927) |  |
Total Other Comprehensive Income (Loss) | 8,699 | (22) | 6,482 |  |
Reclassification of stranded income taxes to retained earnings |  |  | 2,367 |  |
Ending Balance | 10,638 | 1,939 | 13,169 |  |
Pension Liability Adjustment | Public Service Company of New Mexico |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (112,361) | (110,262) | (96,748) |  |
Cumulative effect adjustment |  |  |  | 0 |
Balance at January 1, 2018, as adjusted |  |  |  | (110,262) |
Amounts reclassified from AOCI (pre-tax) | 7,404 | 7,568 | 6,452 |  |
Income tax impact of amounts reclassified | (1,880) | (1,922) | (2,504) |  |
Other OCI changes (pre-tax) | (3,829) | (10,382) | 3,618 |  |
Income tax impact of other OCI changes | 973 | 2,637 | (919) |  |
Total Other Comprehensive Income (Loss) | 2,668 | (2,099) | 6,647 |  |
Reclassification of stranded income taxes to retained earnings |  |  | (20,161) |  |
Ending Balance | (109,693) | (112,361) | (110,262) |  |
Fair Value Adjustment for Cash Flow Hedges |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | 1,153 | (23) |  |
Cumulative effect adjustment |  |  |  | 0 |
Balance at January 1, 2018, as adjusted |  |  |  | $ 1,153 |
Amounts reclassified from AOCI (pre-tax) |  | 216 | 581 |  |
Income tax impact of amounts reclassified |  | (56) | (225) |  |
Other OCI changes (pre-tax) |  | 570 | 1,000 |  |
Income tax impact of other OCI changes |  | (145) | (388) |  |
Total Other Comprehensive Income (Loss) |  | 585 | 968 |  |
Reclassification of stranded income taxes to retained earnings |  |  | 208 |  |
Ending Balance |  |  | $ 1,153 |  |
Fair Value Adjustment for Cash Flow Hedges |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | 1,738 |  |  |  |
Amounts reclassified from AOCI (pre-tax) | 733 |  |  |  |
Income tax impact of amounts reclassified | (186) |  |  |  |
Other OCI changes (pre-tax) | (3,495) |  |  |  |
Income tax impact of other OCI changes | 888 |  |  |  |
Total Other Comprehensive Income (Loss) | (2,060) |  |  |  |
Ending Balance | $ (322) | $ 1,738 |  |  |

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AOCIAttributableToParentNetOfTaxRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 + Details
Name: | us-gaap_ReclassificationFromAociCurrentPeriodTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580 + Details
Name: | us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |