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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Notes and accrued interest receivable |  | $ 128 | $ 98 |
Accounts receivable, including intercompany and related parties |  | 11 | 11 |
Total current assets |  | 2,320 | 2,597 |
Less accumulated depreciation and amortization |  | 5,747 | 5,415 |
Total plant, property, and equipment | [1] | 14,705 | 13,412 |
Other |  | 384 | 352 |
Total other non-current assets |  | 3,315 | 3,176 |
Total Assets |  | 20,340 | 19,185 | $ 17,290
Current portion of long-term debt |  | 706 | 540 |
Accounts and notes payable, including intercompany and related parties |  | 9 | 10 |
Accrued interest, including intercompany |  | 106 | 108 |
Accrued taxes |  | 349 | 316 |
Other liabilities current |  | 142 | 163 |
Total current liabilities |  | 2,302 | 1,948 |
Long-term debt |  | 8,441 | 8,016 |
Net unamortized discounts |  | (12) | (12) |
Postretirement benefits |  | 591 | 872 |
Other non-current liabilities |  | 313 | 299 |
Total non-current liabilities |  | 14,063 | 13,530 |
Common stockholders' equity |  | 3,938 | 3,670 |
Total Liabilities and Equity |  | 20,340 | 19,185 |
CMS Energy [Member] |  |  |  |
Notes and accrued interest receivable |  | 88 | 2 |
Accounts receivable, including intercompany and related parties |  | 9 | 9 |
Total current assets |  | 97 | 11 |
Plant, property, and equipment, gross |  | 16 | 16 |
Less accumulated depreciation and amortization |  | $ 16 | $ 16 |
Total plant, property, and equipment |  |  |  |
Deferred income taxes |  | $ 340 | $ 317 |
Invetment in subsidiaries |  | 6,240 | 5,961 |
Other investments - DB SERP |  | 26 | 22 |
Other |  | 23 | 23 |
Total other non-current assets |  | 6,629 | 6,323 |
Total Assets |  | 6,726 | 6,334 |
Accounts and notes payable, including intercompany and related parties |  | 74 | 86 |
Accrued interest, including intercompany |  | 38 | 37 |
Accrued taxes |  | 23 | 138 |
Other liabilities current |  | 5 | 4 |
Total current liabilities |  | 140 | 265 |
Long-term debt |  | 2,630 | 2,380 |
Net unamortized discounts |  | (7) | (7) |
Postretirement benefits |  | 22 | 24 |
Other non-current liabilities |  | 3 | 2 |
Total non-current liabilities |  | 2,648 | 2,399 |
Common stockholders' equity |  | 3,938 | 3,670 |
Total Liabilities and Equity |  | $ 6,726 | $ 6,334 |
[1] | For the year ended December 31, 2015, utility plant additions were $1.4 billion and utility plant retirements were $187 million. For the year ended December 31, 2014, utility plant additions were $1.6 billion and utility plant retirements were $126 million.

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