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Postretirement Benefit Plans - Employer Contributions to Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Contributions to employee benefit plans    
Funded pension plans $ 23 $ 2
Unfunded pension plans 4 4
Savings and defined contribution pension plans 18 16
Total contributions $ 45 $ 22