Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
| Net Income (Loss) |
$ 148
|
$ 94
|
$ 418
|
$ 382
|
| Retirement Benefits Liability |
|
|
|
|
| Amortization of net actuarial loss (gain), net of tax |
2
|
1
|
4
|
2
|
| Amortization of prior service credit, net of tax |
(1)
|
(1)
|
(1)
|
(1)
|
| Investments |
|
|
|
|
| Unrealized gain (loss) on investments, net of tax |
(2)
|
|
(3)
|
|
| Derivative Instruments |
|
|
|
|
| Reclassification adjustments included in net income, net of tax |
|
|
|
1
|
| Other Comprehensive Income (Loss) |
(1)
|
|
|
2
|
| Comprehensive Income (Loss) |
147
|
94
|
418
|
384
|
| Comprehensive Income Attributable to Noncontrolling Interest |
|
|
1
|
1
|
| Comprehensive Income Attributable to CMS Energy |
147
|
94
|
417
|
383
|
| Consumers Energy Company [Member] |
|
|
|
|
| Net Income (Loss) |
160
|
119
|
459
|
449
|
| Retirement Benefits Liability |
|
|
|
|
| Amortization of net actuarial loss (gain), net of tax |
1
|
1
|
3
|
2
|
| Investments |
|
|
|
|
| Unrealized gain (loss) on investments, net of tax |
|
(1)
|
(2)
|
2
|
| Reclassification adjustments included in net income, net of tax |
|
|
(5)
|
|
| Derivative Instruments |
|
|
|
|
| Other Comprehensive Income (Loss) |
1
|
|
(4)
|
4
|
| Comprehensive Income Attributable to CMS Energy |
$ 161
|
$ 119
|
$ 455
|
$ 453
|