Consideration of Credit Risk and Concentrations (Details) - Credit Concentration Risk $ in Millions	Dec. 31, 2021 USD ($) Counterparty
Derivative [Line Items]
Number of most significant counterparties	10
Municipal or Cooperative Entities or Other Utilities
Derivative [Line Items]
Number of most significant counterparties	6
External Credit Rating, Investment Grade
Derivative [Line Items]
Number of most significant counterparties	8
Credit exposure for the most significant counterparties | $	$ 33
Percentage of credit exposure for the most significant counterparties	63.00%
Internal Investment Grade [Member]
Derivative [Line Items]
Number of most significant counterparties	1
Credit exposure for the most significant counterparties | $	$ 17
Percentage of credit exposure for the most significant counterparties	34.00%
External Credit Rating, Non Investment Grade
Derivative [Line Items]
Number of most significant counterparties	1
Percentage of credit exposure for the most significant counterparties	1.00%