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Consolidated Statements Of Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Revenue $ 1,527 $ 1,587 $ 4,805 $ 4,759
Operating Expenses        
Fuel for electric generation 144 145 386 367
Purchased and interchange power 426 454 1,132 1,165
Purchased power - related parties 21 22 64 65
Cost of gas sold 47 45 494 490
Maintenance and other operating expenses 304 301 909 890
Depreciation and amortization 193 183 652 597
General taxes 62 62 209 209
Total operating expenses 1,197 1,212 3,846 3,783
Operating Income 330 375 959 976
Other Income (Expense)        
Interest income 3 1 10 4
Allowance for equity funds used during construction 1 3 5 9
Income from equity method investees 3 5 10 12
Nonoperating retirement benefits, net 3 11 10 31
Other income 2 2 4 7
Other expense (2) (6) (6) (13)
Total other income 10 16 33 50
Interest Charges        
Interest on long-term debt 101 103 304 306
Other interest expense 10 8 26 22
Allowance for borrowed funds used during construction   (1) (2) (4)
Total interest charges 111 110 328 324
Income Before Income Taxes 229 281 664 702
Income Tax Expense 57 95 200 227
Net Income 172 186 464 475
Income Attributable to Noncontrolling Interests     1 1
Net Income Available to Common Stockholders $ 172 $ 186 $ 463 $ 474
Basic Earnings Per Average Common Share $ 0.61 $ 0.67 $ 1.65 $ 1.71
Diluted Earnings Per Average Common Share 0.61 0.67 1.65 1.70
Dividends Declared Per Common Share $ 0.3325 $ 0.3100 $ 0.9975 $ 0.9300
Consumers Energy Company [Member]        
Operating Revenue $ 1,437 $ 1,498 $ 4,536 $ 4,514
Operating Expenses        
Fuel for electric generation 115 118 304 290
Purchased and interchange power 424 445 1,124 1,148
Purchased power - related parties 23 23 67 66
Cost of gas sold 42 39 479 477
Maintenance and other operating expenses 274 274 824 816
Depreciation and amortization 191 182 646 592
General taxes 60 61 203 207
Total operating expenses 1,129 1,142 3,647 3,596
Operating Income 308 356 889 918
Other Income (Expense)        
Interest income 2 1 8 3
Interest and dividend income - related parties       1
Allowance for equity funds used during construction 1 3 5 9
Nonoperating retirement benefits, net 3 9 8 28
Other income 1 2 15 7
Other expense (2) (6) (6) (13)
Total other income 5 9 30 35
Interest Charges        
Interest on long-term debt 66 65 198 195
Other interest expense 4 3 11 9
Allowance for borrowed funds used during construction   (1) (2) (4)
Total interest charges 70 67 207 200
Income Before Income Taxes 243 298 712 753
Income Tax Expense 62 103 216 254
Net Income 181 195 496 499
Preferred Stock Dividends     1 1
Net Income Available to Common Stockholders $ 181 $ 195 $ 495 $ 498