v3.25.4

Retirement Benefits (Schedule of Funded Status of Retirement Benefit Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
DB Pension Plans |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of period | $ 2,094 | $ 2,195 |
Service cost | 25 | 28 |
Interest cost | 109 | 104 |
Plan amendments | 0 | 0 |
Actuarial loss (gain) | 53 | (91) |
Benefits paid | (158) | (142) |
Benefit obligation at end of period | 2,123 | 2,094 | $ 2,195
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Plan assets at fair value at beginning of period | 2,964 | 3,004 |
Actual return on plan assets | 371 | 102 |
Company contribution | 0 | 0 |
Actual benefits paid | (158) | (142) |
Plan assets at fair value at end of period | 3,177 | 2,964 | 3,004
Funded status | 1,054 | 870 |
DB Pension Plans | Consumers Energy Company |  |  |
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Funded status | 1,000 | 836 |
DB SERP |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of period | 105 | 114 |
Service cost | 0 | 0 |
Interest cost | 5 | 5 |
Plan amendments | 0 | 0 |
Actuarial loss (gain) | 4 | (4) |
Benefits paid | (10) | (10) |
Benefit obligation at end of period | 104 | 105 | 114
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Plan assets at fair value at beginning of period | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contribution | 10 | 10 |
Actual benefits paid | (10) | (10) |
Plan assets at fair value at end of period | 0 | 0 | 0
Funded status | (104) | (105) |
DB SERP | Consumers Energy Company |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of period | 76 | 83 |
Service cost | 0 | 0 |
Interest cost | 4 | 4 |
Plan amendments | 0 | 0 |
Actuarial loss (gain) | 3 | (4) |
Benefits paid | (7) | (7) |
Benefit obligation at end of period | 76 | 76 | 83
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Plan assets at fair value at beginning of period | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contribution | 7 | 7 |
Actual benefits paid | (7) | (7) |
Plan assets at fair value at end of period | 0 | 0 | 0
Funded status | (76) | (76) |
OPEB Plan |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of period | 831 | 900 |
Service cost | 8 | 11 | 12
Interest cost | 43 | 43 | 44
Plan amendments | 0 | (25) |
Actuarial loss (gain) | 2 | (40) |
Benefits paid | (54) | (58) |
Benefit obligation at end of period | 830 | 831 | 900
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Plan assets at fair value at beginning of period | 1,588 | 1,559 |
Actual return on plan assets | 197 | 86 |
Company contribution | 0 | 0 |
Actual benefits paid | (52) | (57) |
Plan assets at fair value at end of period | 1,733 | 1,588 | 1,559
Funded status | 903 | 757 |
OPEB Plan | Consumers Energy Company |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of period | 801 | 867 |
Service cost | 8 | 11 | 11
Interest cost | 42 | 41 | 42
Plan amendments | 0 | (24) |
Actuarial loss (gain) | 1 | (38) |
Benefits paid | (51) | (56) |
Benefit obligation at end of period | 801 | 801 | 867
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Plan assets at fair value at beginning of period | 1,479 | 1,453 |
Actual return on plan assets | 184 | 80 |
Company contribution | 0 | 0 |
Actual benefits paid | (50) | (54) |
Plan assets at fair value at end of period | 1,613 | 1,479 | $ 1,453
Funded status | $ 812 | $ 678 |

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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