Leases (Policies)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Early Termination [Policy Text Block]	The option to extend or terminate a lease is based on customary early termination provisions in the contract, such as payment defaults, bankruptcy, and lack of performance on energy delivery.
Separation of Lease and Nonlease Components [Policy Text Block]	Capacity receipts are generally considered lease elements as they cover the majority of available output from a facility. The allocation of contract payments between the lease and non-lease elements is made at the inception of the lease.