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Employee Benefits - Expected Benefit Payments to Retirees (Detail)
$ in Millions
Dec. 31, 2023
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 1,401
2025 1,681
2026 1,639
2027 977
2028 974
2029 to 2033 4,734
Health Care and Life  
Defined Benefit Plan Disclosure [Line Items]  
2024 812
2025 824
2026 829
2027 836
2028 843
2029 to 2033 $ 4,294