Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) assessment	Oct. 31, 2021 facility	Jun. 30, 2019 facility	Apr. 30, 2019 case	Feb. 28, 2019 case
Loss Contingencies [Line Items]
Nuclear insurance liability limit per incident	$ 13,800
Required nuclear liability insurance	450
Nuclear financial protection pool mandated by the Price-Anderson Act	13,300
Maximum assessment mandated by Price-Anderson Act per nuclear reactor for a nuclear incident	$ 138
Maximum assessment, administrative fee (as percent)	5.00%
Maximum assessment payment mandated by Price-Anderson Act for a nuclear incident	$ 21
Maximum assessment	44.00%
Nuclear operator maximum annual assessment	$ 9
Maximum liability per nuclear incident	61
Mutual property insurance additional blanket policy property coverage	1,300
Nuclear property insurance coverage limit per individual insured	1,500
Lost revenue insurance maximum weekly recovery	$ 3
Insurance coverage, waiting period	56 days
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss	$ 2
The number of months a nuclear industry mutual insurance company will respond to retrospective premium adjustments	24 months
Number of years board of directors of industry mutual insurance company can adjust policy after policy expires	6 years
Number of facilities | facility		2
Sierra Club Et Al V. Midwest Generation L L C
Loss Contingencies [Line Items]
Number of facilities | facility			4
Direct Energy vs. Stanley, Forte, Schafer and Lane
Loss Contingencies [Line Items]
Number of class action lawsuits | case				3
Direct Energy vs. Burk and Dickson Litigation
Loss Contingencies [Line Items]
Number of class action lawsuits | case					2
High
Loss Contingencies [Line Items]
Multiplier that the industry mutual insurance company may assess against insureds premium | assessment	10
Low
Loss Contingencies [Line Items]
Multiplier that the industry mutual insurance company may assess against insureds premium | assessment	6
Nuclear Event
Loss Contingencies [Line Items]
Total nuclear property insurance coverage	$ 2,800
Lost revenue insurance maximum weekly recovery	274
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss	216
Non-nuclear Event
Loss Contingencies [Line Items]
Total nuclear property insurance coverage	1,000
Lost revenue insurance maximum weekly recovery	184
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss	$ 144