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Employee Benefit Plans (Expected Benefit Payments for Company's Pension and Postretirement Plans as well as Expected Medicare Part D Subsidy Receipts Related to Postretirement Plan) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 1,049
2025 863
2026 854
2027 885
2028 894
2029-2033 4,588
Total 9,133
Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2024 123
2025 124
2026 122
2027 115
2028 103
2029-2033 376
Total $ 963