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Contingencies And Commitments (Guarantees) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
$ / MWh
MW
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Guarantees And Other Contingencies [Line Items]        
PPE reduction resulting from tax refund   $ 34    
Income Tax Settlement [Member]        
Guarantees And Other Contingencies [Line Items]        
Reduction of income tax expense   3    
General Taxes [Member]        
Guarantees And Other Contingencies [Line Items]        
Reduction of income tax expense   $ 3    
Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Expiration Date [1]   Indefinite    
Maximum obligation [1]   $ 30    
Consumers Energy Company [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund $ 60   $ 37  
Tax refund received 13      
Note receivable in 2017 30      
Note receivable, in 2018 17      
Gain (loss) related to tax settlement   $ 4    
Consumers Energy Company [Member] | Interest Expense [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund     12  
Consumers Energy Company [Member] | Interest Income [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund     6  
Consumers Energy Company [Member] | General Taxes [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund     5  
Consumers Energy Company [Member] | Refund Of Taxes Paid Receivable [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund 42      
Consumers Energy Company [Member] | Refund Of Interest Paid Receivable [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund 12      
Consumers Energy Company [Member] | Interest Receivable [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund $ 6      
Consumers Energy Company [Member] | Plant, Property, And Equipment [Member] | Settlement with Taxing Authority [Member]        
Guarantees And Other Contingencies [Line Items]        
Tax examination refund     19  
Guarantees [Member]        
Guarantees And Other Contingencies [Line Items]        
Expiration Date [1]   Indefinite    
Maximum obligation [1]   $ 48    
Indemnity Obligations From Stock And Asset Sales Agreements [Member]        
Guarantees And Other Contingencies [Line Items]        
Expiration Date [2]   Indefinite    
Maximum obligation [2]   $ 153    
Carrying Amount [2]   7    
Tax And Other Indemnity Obligations [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Carrying Amount   1    
MCV PPA [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   3,010    
Purchase Obligations Due in Year One   326    
Purchase Obligations Due in Year Two   331    
Purchase Obligations Due in Year Three   330    
Purchase Obligations Due in Year Four   344    
Purchase Obligations Due in Year Five   325    
Purchase Obligations Due After Year Five   $ 1,354    
Term of Unrecorded Unconditional Purchase Obligations   35 years    
Unrecorded Unconditional Purchase Obligations, Minimum Quantity Required | MW   1,240    
Unrecorded Unconditional Purchase Obligation Capacity Charge Per Mwh | $ / MWh   10.14    
Unrecorded Unconditional Purchase Obligation, Annual Contribution to Renewable Resources Program By Counterparty   $ 5    
Unrecorded Unconditional Purchase Obligation, Contract Extension Period   5 years    
Unrecorded Unconditional Purchase Obligation, Purchases   $ 305 282 $ 300
Palisades PPA [Member]        
Guarantees And Other Contingencies [Line Items]        
Unrecorded Unconditional Purchase Obligations, Maximum Quantity | MW   798    
Palisades PPA [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   $ 1,994    
Purchase Obligations Due in Year One   354    
Purchase Obligations Due in Year Two   365    
Purchase Obligations Due in Year Three   376    
Purchase Obligations Due in Year Four   388    
Purchase Obligations Due in Year Five   398    
Purchase Obligations Due After Year Five   113    
Unrecorded Unconditional Purchase Obligation, Purchases   $ 363 352 302
Unrecorded Unconditional Purchase Obligations, Maximum Quantity | MW   798    
Related Parties PPA [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   $ 899    
Purchase Obligations Due in Year One   81    
Purchase Obligations Due in Year Two   82    
Purchase Obligations Due in Year Three   86    
Purchase Obligations Due in Year Four   88    
Purchase Obligations Due in Year Five   88    
Purchase Obligations Due After Year Five   474    
Other PPA [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   3,453    
Purchase Obligations Due in Year One   247    
Purchase Obligations Due in Year Two   253    
Purchase Obligations Due in Year Three   229    
Purchase Obligations Due in Year Four   231    
Purchase Obligations Due in Year Five   233    
Purchase Obligations Due After Year Five   2,260    
Unrecorded Unconditional Purchase Obligation, Purchases   348 $ 347 $ 354
PPA [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   9,356    
Purchase Obligations Due in Year One   1,008    
Purchase Obligations Due in Year Two   1,031    
Purchase Obligations Due in Year Three   1,021    
Purchase Obligations Due in Year Four   1,051    
Purchase Obligations Due in Year Five   1,044    
Purchase Obligations Due After Year Five   4,201    
Other Purchase Obligations [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   1,922    
Purchase Obligations Due in Year One   931    
Purchase Obligations Due in Year Two   376    
Purchase Obligations Due in Year Three   187    
Purchase Obligations Due in Year Four   132    
Purchase Obligations Due in Year Five   32    
Purchase Obligations Due After Year Five   264    
Other Purchase Obligations [Member] | Consumers Energy Company [Member]        
Guarantees And Other Contingencies [Line Items]        
Purchase Obligations Total   1,651    
Purchase Obligations Due in Year One   895    
Purchase Obligations Due in Year Two   347    
Purchase Obligations Due in Year Three   157    
Purchase Obligations Due in Year Four   102    
Purchase Obligations Due in Year Five   19    
Purchase Obligations Due After Year Five   $ 131    
[1] At Consumers, this obligation comprises a guarantee provided to the U.S. Department of Energy in connection with a settlement agreement regarding damages resulting from the department's failure to accept spent nuclear fuel from nuclear power plants formerly owned by Consumers. At CMS Energy, the guarantee obligations comprise Consumers' guarantee to the U.S. Department of Energy and CMS Energy's 1994 guarantee of non-recourse revenue bonds issued by Genesee. For additional details on this guarantee, see Note 20, Variable Interest Entities.
[2] These obligations arose from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy indemnified the purchaser for losses resulting from various matters, primarily claims related to taxes. CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.