Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 116	$ 148
Regulatory Liability, Noncurrent		761	715
Regulatory assets not currently earning a return		123	48
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	0	0	[2]
Regulatory Liability, Noncurrent	[1]	458	469	[2]
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[2]
Regulatory Liability, Noncurrent		$ 223	198	[2]
Deferred Electric Energy Costs | Maximum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Contract Valuation Adjustments
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[3]	$ 41	119	[2]
Regulatory Liability, Noncurrent	[3]	$ 0	1	[2]
Contract Valuation Adjustments | Maximum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 14	19	[2]
Regulatory Liability, Noncurrent		10	5	[2]
Effect of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[2]
Regulatory Liability, Noncurrent		19	20	[2]
Renewable resources and environmental initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[2]
Regulatory Liability, Noncurrent		8	14	[2]
Formula rates
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		13	10	[2]
Regulatory Liability, Noncurrent		$ 10	8	[2]
Formula rates | Minimum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Formula rates | Maximum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		2 years
Deferred Fuel Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 15	0	[2]
Regulatory Liability, Noncurrent		0	0	[2]
LP&L Departure Payment
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		33	0	[2]
Regulatory Liability, Noncurrent		$ 33	$ 0	[2]
LP&L Departure Payment | Maximum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		10 years

[1] Includes the revaluation of recoverable/regulated plant accumulated deferred income taxes and revaluation impact of non-plant accumulated deferred income taxes due to the TCJA.

[2] Prior period amounts have been reclassified to conform with current year presentation.

[3] Includes the fair value of FTR instruments utilized/intended to offset the impacts of transmission system congestion.