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Postretirement Benefit Plans - Additional Information (Details)
$ in Millions
3 Months Ended
Jun. 30, 2024
USD ($)
Retirement Benefits [Abstract]  
Net actuarial gains (losses), amortization periods 15 years
Expected long-term rate of return on plan assets 6.30%
Maximum amortization period of unfunded actuarial liability 15 years
Expected additional contribution to funded pension plan $ 15
Expected additional contribution to unfunded pension plan 13
Expected additional contribution to savings and defined contribution plans $ 43