Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 707	$ 694
Derivative Liabilities	$ (597)	$ (605)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current, Derivative Asset, Noncurrent	Derivative Asset, Current, Derivative Asset, Noncurrent
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 482	$ 488
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(413)	(441)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	225	206
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(184)	(164)
Interest rate contracts (Enter as Other)
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	(1)	(1)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	372	428
Derivative Liabilities	(329)	(410)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	275	187
Derivative Liabilities	(235)	(150)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	57	58
Derivative Liabilities	(32)	(44)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Derivative Liabilities	(1)	(1)
Derivatives designated as hedging instruments \| Interest rate contracts (Enter as Other)
Derivatives, Fair Value [Line Items]
Derivative Assets	3	20
Derivative Liabilities	0	0
Derivatives designated as hedging instruments \| Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1)	(1)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	704	674
Derivative Liabilities	(596)	(604)
Derivatives not designated as hedging instruments \| Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments \| Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	372	428
Derivative Liabilities	(329)	(410)
Derivatives not designated as hedging instruments \| Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	275	187
Derivative Liabilities	(235)	(150)
Derivatives not designated as hedging instruments \| Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	57	58
Derivative Liabilities	$ (32)	$ (44)

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