Retirement Benefits (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2026

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 March 31
	Pension Benefits				OPB
$ in millions	2026		2025		2026		2025
Components of net periodic benefit cost (benefit)
Service cost	$	53	$	54	$	1	$	1
Interest cost	399		403		15		16
Expected return on plan assets	(565)		(540)		(22)		(21)
Amortization of prior service credit	—		—		(1)		(1)
Other	—		7		—		—
Net periodic benefit cost (benefit)	$	(113)	$	(76)	$	(7)	$	(5)

Employer contributions to retirement plans

Contributions made by the company to its retirement plans are as follows:

	Three Months Ended March 31
$ in millions	2026		2025
Defined benefit pension plans	$	22	$	18
OPB plans	11		10
Defined contribution plans	229		229