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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 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 June 30Six Months Ended June 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20222021202220212022202120222021
Components of net periodic benefit cost (benefit)
Service cost$92 $103 $2 $4 $184 $207 $4 $8 
Interest cost284 264 12 14 568 527 24 27 
Expected return on plan assets(661)(629)(27)(27)(1,321)(1,257)(55)(53)
Amortization of prior service (credit) cost— (2)(1)(1)— (4)(1)(1)
Net periodic benefit cost (benefit)$(285)$(264)$(14)$(10)$(569)$(527)$(28)$(19)
Employer contributions to retirement plans Contributions made by the company to its retirement plans are as follows:
 Three Months Ended June 30Six Months Ended June 30
$ in millions2022202120222021
Defined benefit pension plans$25 $26 $51 $53 
OPB plans10 10 20 21 
Defined contribution plans122 111 321 377