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Other Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Income and Expenses [Abstract]
Real estate income	$ 74	$ 70	$ 240	$ 192
Interest income	12	15	42	39
Net periodic pension benefit/(costs)	13	12	40	42
Non-operating property environmental remediation and restoration	(6)	(7)	(18)	(21)
Interest from IRS refund claims	0	0	0	24
Other	3	(3)	(7)	6
Total	$ 96	$ 87	$ 297	$ 282

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- Definition

Environmental Remediation And Restoration

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Interest From Federal Refund Claims

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- Definition

The amount of income (expense) from other nonoperating activities not otherwise specified.

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- Definition

Amount of interest income earned from interest bearing assets classified as other.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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Amount of income (expense) related to nonoperating activities, classified as other.

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The net cost of operation of other real estate (including provisions for real estate losses, rental income, and gains and losses on sales of real estate).

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