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Employee Benefit Plans - Expected Cash Flows for Pension and Post-Retirement Benefit Plans (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Plans  
Employer Contributions:  
2024 expected contributions $ 0
Expected Benefit Payments:  
2024 11
2025 12
2026 12
2027 12
2028 12
2029-2033 66
Post-retirement Benefits  
Employer Contributions:  
2024 expected contributions 4
Expected Benefit Payments:  
2024 4
2025 5
2026 4
2027 4
2028 4
2029-2033 $ 23