Early Plant Retirements Early Plant Retirements (Details) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
		Oct. 31, 2021	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
ZEC Charge per kwh				$ 0.004
ZEC Charge per MWh				10
Gain (Loss) on Asset Disposition						$ 122,000,000
Liabilities Held for Sale				0	$ 144,000,000
Loss on Extinguishment of Debt				0	(298,000,000)	$ 0
Expected Production Tax Credit per MWh				15
Energy Holdings [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group				20,000,000
Impairment of Long-Lived Assets to be Disposed of				78,000,000
Noncurrent Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Liabilities Held for Sale	[1]				87,000,000
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
Fossil Production [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					2,060,000,000
Liabilities Held for Sale					144,000,000
Proceeds from Divestiture of Businesses			$ 1,920,000,000
Impairment of Long-Lived Assets to be Disposed of				$ 50,000,000	2,691,000,000
Loss on Extinguishment of Debt		$ 298,000,000
Severance Costs					13,000,000
Fossil Production [Member] | Current Assets [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group	[2]				264,000,000
Fossil Production [Member] | Property, Plant and Equipment
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					1,742,000,000
Fossil Production [Member] | Noncurrent Assets [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group					54,000,000
Fossil Production [Member] | Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Liabilities Held for Sale	[3]				$ 57,000,000

[1] Primarily includes Asset Retirement Obligations (AROs), Accrued Pension Costs and Other Noncurrent Liabilities

[2] Primarily includes Fuel, Materials and Supplies, Prepayments and Other Current Assets.

[3] Primarily includes Accounts Payable and Other Current Liabilities.