Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 142	$ 116
Regulatory Liability, Noncurrent		768	761
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	0	0
Regulatory Liability, Noncurrent	[1]	436	458
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		$ 267	223
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	[2]	$ 67	41
Regulatory Liability, Noncurrent	[2]	$ 0	0
Contract Valuation Adjustments | Maximum [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 14	14
Regulatory Liability, Noncurrent		16	18
Effect of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		18	19
Formula rates
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		16	13
Regulatory Liability, Noncurrent		$ 2	10
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		$ 41	15
Regulatory Liability, Noncurrent		0	0
LP&L Departure Payment
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		4	33
Regulatory Liability, Noncurrent		$ 29	$ 33

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