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Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule II - Valuation and Qualifying Accounts and Reserves | Schedule II — Valuation and Qualifying Accounts and Reserves CMS Energy Corporation Years Ended December 31, 2018, 2017, and 2016
In Millions |
Description | Balance at Beginning of Period |  | Charged to Expense |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period |
Allowance for uncollectible accounts 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 29 |  |  | $ | 20 |
2017 |  | 24 |  |  | 29 |  |  | — |  |  | 33 |  |  | 20 |
2016 |  | 28 |  |  | 31 |  |  | — |  |  | 35 |  |  | 24 |
Deferred tax valuation allowance |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 15 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 8 |
2017 |  | 5 |  |  | 10 |  |  | — |  |  | — |  |  | 15 |
2016 |  | 4 |  |  | 1 |  |  | — |  |  | — |  |  | 5 |
Allowance for notes receivable 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 21 |  |  | $ | 24 |
2017 |  | 16 |  |  | 20 |  |  | — |  |  | 16 |  |  | 20 |
2016 |  | 9 |  |  | 19 |  |  | — |  |  | 12 |  |  | 16 |
1 | Deductions represent write-offs of uncollectible accounts, net of recoveries.
Consumers Energy Company Years Ended December 31, 2018, 2017, and 2016
In Millions |
Description | Balance at Beginning of Period |  | Charged to Expense |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period |
Allowance for uncollectible accounts 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 29 |  |  | $ | 20 |
2017 |  | 24 |  |  | 29 |  |  | — |  |  | 33 |  |  | 20 |
2016 |  | 28 |  |  | 31 |  |  | — |  |  | 35 |  |  | 24 |
1 | Deductions represent write-offs of uncollectible accounts, net of recoveries.
Consumers Energy Company |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule II - Valuation and Qualifying Accounts and Reserves | Schedule II — Valuation and Qualifying Accounts and Reserves CMS Energy Corporation Years Ended December 31, 2018, 2017, and 2016
In Millions |
Description | Balance at Beginning of Period |  | Charged to Expense |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period |
Allowance for uncollectible accounts 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 29 |  |  | $ | 20 |
2017 |  | 24 |  |  | 29 |  |  | — |  |  | 33 |  |  | 20 |
2016 |  | 28 |  |  | 31 |  |  | — |  |  | 35 |  |  | 24 |
Deferred tax valuation allowance |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 15 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 8 |
2017 |  | 5 |  |  | 10 |  |  | — |  |  | — |  |  | 15 |
2016 |  | 4 |  |  | 1 |  |  | — |  |  | — |  |  | 5 |
Allowance for notes receivable 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 21 |  |  | $ | 24 |
2017 |  | 16 |  |  | 20 |  |  | — |  |  | 16 |  |  | 20 |
2016 |  | 9 |  |  | 19 |  |  | — |  |  | 12 |  |  | 16 |
1 | Deductions represent write-offs of uncollectible accounts, net of recoveries.
Consumers Energy Company Years Ended December 31, 2018, 2017, and 2016
In Millions |
Description | Balance at Beginning of Period |  | Charged to Expense |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period |
Allowance for uncollectible accounts 1 |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 20 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 29 |  |  | $ | 20 |
2017 |  | 24 |  |  | 29 |  |  | — |  |  | 33 |  |  | 20 |
2016 |  | 28 |  |  | 31 |  |  | — |  |  | 35 |  |  | 24 |
1 | Deductions represent write-offs of uncollectible accounts, net of recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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