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Benefit Plans (Schedule of Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 12 | $ 11 | $ 21 | $ 20
Interest cost | 81 | 83 | 161 | 166
Expected return on plan assets | (117) | (122) | (233) | (243)
Amortization: |  |  |  |
Net loss (gain) | 6 | 1 | 13 | 2
Prior service cost (credit) | 2 | 2 | 3 | 3
Net periodic benefit cost (income) | (16) | (25) | (35) | (52)
Postretirement [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 4 | 4 | 8 | 8
Interest cost | 16 | 17 | 32 | 34
Expected return on plan assets | (2) | (2) | (3) | (4)
Amortization: |  |  |  |
Net loss (gain) | (1) | 0 | (2) | 0
Prior service cost (credit) | (10) | (10) | (20) | (20)
Net periodic benefit cost (income) | $ 7 | $ 9 | $ 15 | $ 18

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