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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Postretirement Benefit Cost Components
Pension and postretirement benefit cost components were as follows:

 Pension BenefitsOther Postretirement Benefits
 Second Quarter
 2023202220232022
 ($ in millions)
Service cost$$10 $$
Interest cost27 17 
Expected return on plan assets(52)(54)(3)(3)
Amortization of net losses12 — — 
Amortization of prior service benefit— — (7)(7)
Net benefit$(18)$(15)$(4)$(6)

 Pension BenefitsOther Postretirement Benefits
 First Six Months
 2023202220232022
 ($ in millions)
Service cost$12 $20 $$
Interest cost54 34 
Expected return on plan assets(104)(107)(6)(6)
Amortization of net losses24 — — 
Amortization of prior service benefit— — (13)(13)
Net benefit$(36)$(29)$(8)$(12)