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Other Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income [Abstract]
Net gain on non-operating asset dispositions.	[1]	$ 3	$ 4	$ 97	$ 14
Rental income		29	34	90	96
Net periodic pension and OPEB costs		12	12	31	28
Interest Income		2	10	11	25
Interest income due to employment tax refund			1		31
Non-operating environmental costs and other		(9)	(8)	(8)	(7)
Total		$ 37	$ 53	221	$ 187
Land and permanent easement sale				$ 69
[1] The nine months ended September 30, 2020 includes a $69 million gain from a land and permanent easement sale to the Illinois State Toll Highway Authority.

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Interest income due to employment tax refund

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The net amount of other income and expense amounts, the components of which are not separately disclosed, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Major component is expenses associated with environmental cost on nonoperating property.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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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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Amount of income (expense) related to nonoperating activities, classified as other.

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Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature.

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