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Benefit Plans (Components of net periodic cost (benefit)) (Details) - Pension Plan - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | $ 24 | $ 16 | $ 49 | $ 33
Expected return on plan assets | (30) | (38) | (60) | (76)
Amortization of net actuarial loss | 9 | 8 | 17 | 15
Total net periodic pension cost (benefit) | $ 3 | $ (14) | $ 6 | $ (28)

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