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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2021
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 millions20212020202120202021202020212020
Components of net periodic benefit cost (benefit)
Service cost$104 $102 $4 $4 $311 $306 $12 $13 
Interest cost263 307 13 17 790 920 40 50 
Expected return on plan assets(627)(594)(26)(26)(1,884)(1,782)(79)(77)
Amortization of prior service (credit) cost(3)(15)— 1 (7)(45)(1)3 
Net periodic benefit cost (benefit)$(263)$(200)$(9)$(4)$(790)$(601)$(28)$(11)
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 millions2021202020212020
Defined benefit pension plans$26 $24 $79 $70 
OPB plans8 7 29 30 
Defined contribution plans99 116 476 472