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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Pension and postretirement benefit plans:
Beginning accumulated pension and postretirement benefits		$ (122)	$ (114)	$ (124)	$ (116)
Recognition of net actuarial loss and prior service cost in earnings	[1]	1	1	4	4
Income tax expense		0	0	(1)	(1)
Accumulated other comprehensive loss, net of tax		$ (121)	$ (113)	$ (121)	$ (113)	$ (124)
[1] Recognition of net actuarial loss and prior service cost are included in the computation of net periodic benefit cost, which is a component of other, net in the accompanying consolidated statements of comprehensive earnings.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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