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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities |  |
Current accounts receivable | $ 11,000,000 | $ 12,000,000
EnerBank notes receivable, net of allowance for loan losses | 284,000,000 | 275,000,000
Current portion of long term debt | 1,500,000,000 | 1,500,000,000
Current portion of long-term payables | 6,000,000 | 6,000,000
Carrying Amount |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable | 2,710,000,000 | 2,887,000,000
Securities held to maturity | 34,000,000 | 28,000,000
Liabilities |  |
Long-term debt | 15,046,000,000 | 15,120,000,000
Long-term payables | 33,000,000 | 33,000,000
Fair Value |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable | 3,006,000,000 | 3,248,000,000
Securities held to maturity | 34,000,000 | 29,000,000
Liabilities |  |
Long-term debt | 16,233,000,000 | 17,512,000,000
Long-term payables | 35,000,000 | 35,000,000
Consumers Energy Company |  |
Liabilities |  |
Current portion of long term debt | 364,000,000 | 364,000,000
DB SERP note receivable – related party | 7,000,000 | 7,000,000
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable related party | 106,000,000 | 107,000,000
Liabilities |  |
Long-term debt | 8,107,000,000 | 8,106,000,000
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable related party | 106,000,000 | 107,000,000
Liabilities |  |
Long-term debt | 8,815,000,000 | 9,801,000,000
Fair Value, Inputs, Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable | 0 | 0
Securities held to maturity | 0 | 0
Liabilities |  |
Long-term debt | 1,206,000,000 | 1,249,000,000
Long-term payables | 0 | 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable related party | 0 | 0
Liabilities |  |
Long-term debt | 0 | 0
Level 2 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable | 0 | 0
Securities held to maturity | 34,000,000 | 29,000,000
Liabilities |  |
Long-term debt | 13,108,000,000 | 14,178,000,000
Long-term payables | 0 | 0
Level 2 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable related party | 0 | 0
Liabilities |  |
Long-term debt | 6,896,000,000 | 7,716,000,000
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable | 3,006,000,000 | 3,248,000,000
Securities held to maturity | 0 | 0
Liabilities |  |
Long-term debt | 1,919,000,000 | 2,085,000,000
Long-term payables | 35,000,000 | 35,000,000
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 16,000,000 | 17,000,000
Notes receivable related party | 106,000,000 | 107,000,000
Liabilities |  |
Long-term debt | 1,919,000,000 | 2,085,000,000
EnerBank |  |
Liabilities |  |
EnerBank notes receivable, net of allowance for loan losses | 284,000,000 | 275,000,000
Unrealized gain on mortgage backed security | $ 0 | $ 1,000,000

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