Early Plant Retirements Early Plant Retirements (Details) - USD ($)	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2022	Oct. 31, 2021	Mar. 31, 2022	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
ZEC Charge per kwh					$ 0.004
ZEC Charge per MWh					10
Gain (Loss) on Asset Disposition				$ (400,000,000)	122,000,000
Assets Held-for-sale, Not Part of Disposal Group					2,060,000,000
Liabilities Held for Sale					144,000,000	$ 0
Impairment of Long-Lived Assets to be Disposed of					2,691,000,000
Loss on Extinguishment of Debt		$ 298,000,000			(298,000,000)	$ 0	$ 0
Severance Costs					13,000,000
Current Assets [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					264,000,000
Property, Plant and Equipment
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					1,742,000,000
Noncurrent Assets [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					54,000,000
Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Liabilities Held for Sale					57,000,000
Noncurrent Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Liabilities Held for Sale					87,000,000
Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from Divestiture of Businesses			$ 1,920,000,000
Impairment of Long-Lived Assets to be Disposed of	$ 20,000,000
Other Production-Solar [Member]
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on Asset Disposition					63,000,000
Deferred ITC previously recognized					185,000,000
Disposal group, gain (loss) on sale tax impact					$ 62,000,000