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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Components of net periodic benefit cost The cost to the company of its pension and other postretirement benefit (OPB) plans is shown in the following table:
 Three Months Ended September 30Nine Months Ended September 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20232022202320222023202220232022
Components of net periodic benefit cost (benefit)
Service cost$59 $92 $2 $2 $177 $276 $4 $6 
Interest cost392 285 17 12 1,176 853 50 36 
Expected return on plan assets(524)(661)(22)(28)(1,573)(1,982)(64)(83)
Amortization of prior service (credit) cost— — — — — — — (1)
Net periodic benefit cost (benefit)$(73)$(284)$(3)$(14)$(220)$(853)$(10)$(42)
Employer contributions to retirement plans Contributions made by the company to its retirement plans are as follows:
 Three Months Ended September 30Nine Months Ended September 30
$ in millions2023202220232022
Defined benefit pension plans$26 $26 $80 $77 
OPB plans7 9 28 29 
Defined contribution plans126 108 487 429