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Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 9 | $ 16 | $ 29 | $ 48
Interest cost | 84 | 51 | 250 | 155
Expected return on plan assets | (121) | (123) | (364) | (370)
Amortization: |  |  |  |
Net loss (gain) | 1 | 24 | 3 | 72
Prior service cost (credit) | 1 | 2 | 4 | 5
Net periodic benefit cost (income) | (26) | (30) | (78) | (90)
Postretirement [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 3 | 7 | 11 | 17
Interest cost | 15 | 11 | 49 | 31
Expected return on plan assets | (1) | (4) | (5) | (10)
Amortization: |  |  |  |
Net loss (gain) | (2) | 6 | (2) | 14
Prior service cost (credit) | (10) | (11) | (30) | (34)
Net periodic benefit cost (income) | $ 5 | $ 9 | $ 23 | $ 18

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