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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Periodic Benefit Cost Related to Our Defined Benefit Plans, Net
The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
Pension PlansOther Postretirement
Benefit Plans
2024202320242023
Three months ended March 31
Service cost$28 $28 $$
Interest cost31 30 
Expected return on plan assets(53)(50)— — 
Amortization of:
Net actuarial gain(1)(2)(1)(1)
Prior service credit(3)(5)— (1)
Net periodic benefit cost$$$$