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Number of known locations and projects of environmental loss contingencies.

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A representative sample of the total number of environmental locations and projects.

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Liability associated with the representative sample of environmental locations and projects.

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Number of years over which environmental liabilities are expected to be paid out.

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Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag

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Number of locations the company or its subsidiaries in conjunction with other parties have been identified as potentially responsible parties by the Environmental Protection Agency (EPA).

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No definition available.

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Undiscounted amount of accrual for environmental loss contingency to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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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Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

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Commitments and Contingencies - Other Commitments and Contingencies (Details) $ in Millions	3 Months Ended		9 Months Ended		41 Months Ended
	Sep. 30, 2026 USD ($) location	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) location	Sep. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($) location
Loss Contingencies [Line Items]
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag	Consolidated Balance Sheets		Consolidated Balance Sheets
Number of locations with one or more subsidiaries in conjunction with other parties identified as potentially responsible parties \| location	8		8
Employees covered by collective bargaining agreements			80.00%
Other Environmental Claims
Loss Contingencies [Line Items]
Environmental matters liabilities	$ 58		$ 58			$ 63
Current environmental liability	$ 15		$ 15			$ 15
Known cleanup and remediation locations and projects \| location	69		69			69
Number of sites - representative sample \| location	18		18
Liability associated with those sites	$ 51		$ 51
Environmental locations representative sample liability payout period, in years			5 years
Eastern Ohio Incident
Loss Contingencies [Line Items]
Insurance recoveries	$ 3	$ 16	$ 7	$ 314	$ 1,100