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Employee Benefit Plans - Schedule of Pre-tax Change in Other Comprehensive Loss (Income) (Details) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Recognized in the Balance Sheet |  |  |
(Gains) Losses | $ (75) | $ 141 |
Expense Recognized in the Income Statement |  |  |
Amortization of Net Loss | 29 | 50 | $ 73
Settlement Loss | $ 0 | $ 1 | $ 0

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