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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities |  |
Current accounts receivable | $ 9 | $ 12
Current portion of long term debt | 572 | 571
Current portion of long-term payables | 22 | 6
Carrying Amount |  |
Assets |  |
Long-term receivables | 14 | 17
Liabilities |  |
Long-term debt | 12,599 | 12,315
Long-term payables | 31 | 33
Fair Value |  |
Assets |  |
Long-term receivables | 14 | 17
Liabilities |  |
Long-term debt | 13,886 | 14,601
Long-term payables | 32 | 35
Consumers Energy Company |  |
Liabilities |  |
Current accounts receivable | 9 | 12
Current portion of long term debt | 364 | 364
DB SERP note receivable – related party | 7 | 7
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 14 | 17
Notes receivable related party | 104 | 107
Liabilities |  |
Long-term debt | 8,392 | 8,106
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 14 | 17
Notes receivable related party | 104 | 107
Liabilities |  |
Long-term debt | 9,411 | 9,801
Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Liabilities |  |
Long-term debt | 1,195 | 1,249
Long-term payables | 0 | 0
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
Liabilities |  |
Long-term debt | 10,727 | 11,267
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 | 7,447 | 7,716
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 14 | 17
Liabilities |  |
Long-term debt | 1,964 | 2,085
Long-term payables | 32 | 35
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 14 | 17
Notes receivable related party | 104 | 107
Liabilities |  |
Long-term debt | $ 1,964 | $ 2,085

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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