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Investment And Other Income, Net (Components Of Investment And Other Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investment And Other Income (loss), Net [Abstract]
Interest and dividend income	$ 4	$ 20	$ 20	$ 58
Pension benefit	7	9	19	30
OPEB costs	(1)	(1)	(3)	(3)
OPEB remeasurement gain (loss)	0	(21)	(8)	6
Pension remeasurement gain	0	23	44	25
Pension building sale (loss)	(19)		(19)
All other, net		(1)	1	1
Total investment and other income (loss), net	$ (9)	$ 29	$ 54	$ 117

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- Definition

Amount of investment and other nonoperating income (expense), net.

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OPEB Costs (Benefit)

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OPEB Remeasurement

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Pension Building Sale (Loss)

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Pension Remeasurement Gain (Loss)

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- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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Amount of cost (reversal of cost) for pension and other postretirement benefits.

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