Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp Income/(Expense)) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 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) | $ (7) | $ (22) | $ (37) | $ (34) |