Accounting Policies and Supplemental Disclosures - Derivative Instruments (Details) MWh in Millions, € in Billions, $ in Billions	3 Months Ended
Mar. 31, 2026 EUR (€) MWh	Mar. 31, 2026 USD ($)
Derivative [Line Items]
Energy contract quantity	200
Period for which the majority of mega-watt hours is expected to be delivered	9 years
March 2026 Euro-denominated Notes issuance of €14.5 billion \| Senior Notes
Derivative [Line Items]
Issuance amount	€ 14.5	$ 16.8
Maximum
Derivative [Line Items]
Derivative term	20 years
Maximum \| Fair Value, Inputs, Level 3 \| Electric Future Prices
Derivative [Line Items]
Derivative, remaining maturity	6 years	6 years
Maximum \| Fair Value, Inputs, Level 3 \| Various Management Assumptions
Derivative [Line Items]
Derivative, remaining maturity	6 years	6 years
Minimum \| Fair Value, Inputs, Level 3 \| Electric Future Prices
Derivative [Line Items]
Derivative, remaining maturity	4 years	4 years
Minimum \| Fair Value, Inputs, Level 3 \| Various Management Assumptions
Derivative [Line Items]
Derivative, remaining maturity	4 years	4 years
Weighted Average
Derivative [Line Items]
Derivative term	15 years

Derivative, Minimum Fulfillment Period For Majority Of Contracts

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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