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Post-retirement and Similar Obligations (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Pension and Postretirement Benefits
The components of net periodic benefit cost for pension benefits for the three months ended March 31, 2024 and 2023, respectively, consisted of:
Three Months Ended March 31,
 20242023
(Millions)  
Service cost$2 $2 
Interest cost28 30 
Expected return on plan assets(40)(36)
Amortization of:
Prior service costs— — 
Actuarial loss7 1 
Net Periodic Benefit Cost$(3)$(3)
The components of net periodic benefit cost for postretirement benefits for the three months ended March 31, 2024 and 2023, respectively, consisted of: 
Three Months Ended March 31,
 20242023
(Millions)  
Service cost$— $— 
Interest cost3 3 
Expected return on plan assets(1)(1)
Amortization of:
Prior service costs— — 
Actuarial loss(1)(3)
Net Periodic Benefit Cost (Credit)$1 $(1)