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Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp Income/(Expense)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Comprehensive Income Information Before Tax [Abstract]
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs (Statement of Income line: Non-service pension and postretirement benefit expense)	$ (5)	$ (21)	$ (42)	$ (55)

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- Definition

Defined Benefit Plan Amortization Of Actuarial Loss/Gain And Prior Service Cost Credit And Recognized Net Gain/Loss Due To Settlements And Curtailments

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