Derivative Instruments and Hedging Activities (Details) € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) MWh Tons		Mar. 31, 2024 USD ($)	Mar. 31, 2025 EUR (€) MWh Tons	Dec. 31, 2024 USD ($) MWh Tons		Dec. 31, 2024 EUR (€) MWh Tons
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ (1)		$ (9)
Derivative Asset, Subject to Master Netting Arrangement, before Offset	48	[1]			$ 3	[2]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	80	[3]			0
Other Current Assets
Derivative [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	35				3
Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	13
Other Current Liabilities
Derivative [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	64
Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	16
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	36				3
Derivative Liability, Subject to Master Netting Arrangement, before Offset	42				0
Energy Related Derivative | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	1				3
Derivative Liability, Subject to Master Netting Arrangement, before Offset	$ 0				$ 0
Derivative, Nonmonetary Notional Amount | MWh	200,000			200,000	300,000		300,000
Energy Related Derivative | Designated as Hedging Instrument
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0		(9)
Energy Related Derivative | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MWh	700,000			700,000	0		0
Natural Gas | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MWh	6,200,000			6,200,000	0		0
Carbon Credit Contracts | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | Tons	700,000			700,000	0		0
Foreign Exchange Contract | Net Investment Hedging
Derivative [Line Items]
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	$ 8		0
Foreign Exchange Contract | Net Investment Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount | €				€ 3,198			€ 0
Commodity Contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	35				$ 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset	42				0
Commodity Contract | Designated as Hedging Instrument
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(6)		0
Derivative Asset, Subject to Master Netting Arrangement, before Offset	12				0
Derivative Liability, Subject to Master Netting Arrangement, before Offset	38				$ 0
Commodity Contract | Cash Flow Hedging
Derivative [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(52)		0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	1		0
Commodity Contract | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 5		$ 0

[1] Includes $35 million recorded in Other current assets and $13 million recorded in Deferred charges and other assets in the accompanying condensed consolidated balance sheet.

[2] Includes $3 million recorded in Other current assets in the accompanying condensed consolidated balance sheet.

[3] Includes $64 million recorded in Other current liabilities and $16 million recorded in Other liabilities in the accompanying condensed consolidated balance sheet.