Leases Power plants subject to tolling contracts (Details) $ in Millions |
Mar. 31, 2019
USD ($)
|
|---|---|
| Power plants subject to tolling contracts [Abstract] | |
| Property, Plant, and Equipment, Owned, Gross | $ 3,055 |
| Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Excluding Capital Leased Assets | (880) |
| Property, Plant and Equipment, Net, Excluding Capital Leased Assets | $ 2,175 |
| X | ||||||||||
- Definition Power plants subject to tolling contracts [Abstract] No definition available.
|
| X | ||||||||||
- Definition Cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land or leased assets). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Gross amount of long-lived physical assets excluding assets held under lease agreements used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets excluding assets held under lease agreements used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|