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Other Income and Other Expense (Summary of Components of Other Income and Other Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Income and Expenses [Line Items] |  |  |
Gain on extinguishment of debt |  | $ 0 | $ 0
Allowance for equity funds used during construction | $ 7 | 6 | 8
Income from equity method investees | 7 | 3 | 10
All other | 13 | 5 | 9
Other income | 195 | 19 | 30
Donations | (1) | (9) | (6)
Civic and political expenditures | (5) | (6) | (5)
All other | (7) | (12) | (7)
Total other expense | (13) | (27) | (18)
Nonrelated Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | 37 | 5 | 3
Consumers Energy Company |  |  |
Other Income and Expenses [Line Items] |  |  |
Allowance for equity funds used during construction | 7 | 6 | 8
All other | 12 | 4 | 8
Other income | 49 | 17 | 23
Donations | (1) | (9) | (6)
Civic and political expenditures | (5) | (6) | (5)
All other | (6) | (10) | (7)
Total other expense | (12) | (25) | (18)
Consumers Energy Company | Nonrelated Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | 25 | 2 | 2
Consumers Energy Company | Related Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | $ 5 | $ 5 | $ 5

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481303/470-50-40-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481303/470-50-40-4 + Details
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