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Leases - Assets and Liabilities of Lessee (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating leases |  |
Right-of-use assets | $ 54 |
Lease liabilities |  |
Current lease liabilities | 10 |
Noncurrent lease liabilities | 44 |
Finance leases |  |
Right-of-use assets | 78 |
Lease liabilities |  |
Current lease liabilities | 8 |
Non-current lease liabilities | $ 65 |
Weighted-average remaining lease term (in years) |  |
Operating leases | 14 years |
Finance leases | 12 years |
Weighted-average discount rate |  |
Operating leases | 3.70% |
Finance leases | 2.00% |
Related party lease liability | $ 6 | $ 10
Consumers Energy Company |  |
Operating leases |  |
Right-of-use assets | 46 |
Lease liabilities |  |
Current lease liabilities | 8 |
Noncurrent lease liabilities | 37 |
Finance leases |  |
Right-of-use assets | 78 |
Lease liabilities |  |
Current lease liabilities | 8 |
Non-current lease liabilities | $ 65 |
Weighted-average remaining lease term (in years) |  |
Operating leases | 13 years |
Finance leases | 12 years |
Weighted-average discount rate |  |
Operating leases | 3.60% |
Finance leases | 2.00% |
Related party lease liability | $ 11 | $ 14
Related Party Lease |  |
Weighted-average discount rate |  |
Related party lease liability | 25 |
Related Party Lease | Consumers Energy Company |  |
Weighted-average discount rate |  |
Related party lease liability | 25 |
Maximum | Related Party Lease |  |
Weighted-average discount rate |  |
Related party lease liability | 1 |
Maximum | Related Party Lease | Consumers Energy Company |  |
Weighted-average discount rate |  |
Related party lease liability | $ 1 |

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