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Retirement Benefits (Unaudited)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
RETIREMENT BENEFITS RETIREMENT BENEFITS
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 millions20242023202420232024202320242023
Components of net periodic benefit cost (benefit)
Service cost$59 $59 $1 $1 $119 $118 $2 $2 
Interest cost382 392 16 16 763 784 31 33 
Expected return on plan assets(549)(525)(22)(21)(1,098)(1,049)(43)(42)
Net periodic benefit cost (benefit)$(108)$(74)$(5)$(4)$(216)$(147)$(10)$(7)
Employer Contributions
The company sponsors defined benefit pension and OPB plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006.
Contributions made by the company to its retirement plans are as follows:
 Three Months Ended June 30Six Months Ended June 30
$ in millions2024202320242023
Defined benefit pension plans$24 $25 $49 $54 
OPB plans9 10 20 21 
Defined contribution plans151 146 381 361