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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2022
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 millions20222021202220212022202120222021
Components of net periodic benefit cost (benefit)
Service cost$92 $104 $2 $4 $276 $311 $6 $12 
Interest cost285 263 12 13 853 790 36 40 
Expected return on plan assets(661)(627)(28)(26)(1,982)(1,884)(83)(79)
Amortization of prior service (credit) cost— (3)— — — (7)(1)(1)
Net periodic benefit cost (benefit)$(284)$(263)$(14)$(9)$(853)$(790)$(42)$(28)
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 millions2022202120222021
Defined benefit pension plans$26 $26 $77 $79 
OPB plans9 8 29 29 
Defined contribution plans108 99 429 476