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Post-retirement and Similar Obligations
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Post-retirement and Similar Obligations Post-retirement and Similar Obligations
During the three and nine months ended September 30, 2024, we made $18 million and $23 million of pension contributions, respectively. We expect to make additional contributions of $5 million for the remainder of 2024.
The components of net periodic benefit cost for pension benefits for the three and nine months ended September 30, 2024 and 2023, respectively, consisted of:
Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
(Millions)    
Service cost$1 $1 $4 $4 
Interest cost27 30 83 91 
Expected return on plan assets(38)(36)(119)(109)
Amortization of:
Prior service costs— — 1 1 
Actuarial loss8 1 23 2 
Settlement Charge1 — 1 — 
Net Periodic Benefit Credit$(1)$(4)$(7)$(11)
The components of net periodic benefit cost for postretirement benefits for the three and nine months ended September 30, 2024 and 2023, respectively, consisted of: 
Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
(Millions)    
Service cost$— $— $1 $1 
Interest cost4 3 10 10 
Expected return on plan assets(1)(1)(3)(4)
Amortization of:
Prior service costs(1)— (1)— 
Actuarial gain(1)(3)(4)(9)
Net Periodic Benefit Credit (Cost)$1 $(1)$3 $(2)