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Investment And Other Income, Net (Components Of Investment And Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment And Other Income, Net [Abstract]
Interest and dividend income	$ 80	$ 87	$ 42
Pension benefit	38	19	75
OPEB costs	(3)	(9)	(18)
OPEB remeasurement gain (loss)	35	(3)	248
Pension remeasurement (loss) gain	(45)	202	218
All other, net		(18)	(11)
Total investment and other income, net	$ 105	$ 278	$ 554

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- Definition

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

+ References

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- Definition

OPEB Costs (Benefit)

+ References

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- Definition

OPEB Remeasurement

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- Definition

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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- Definition

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

+ References

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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- Definition

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

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