Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2023

Pension [Member]

Net Periodic Benefit Cost

	Pension Benefits
	For the three months ended June 30,				For the six months ended June 30,
($ in millions)	2023		2022		2023		2022
Components of total pension benefit cost
Service cost	$	14	$	20	$	27	$	41
Interest cost on projected benefit obligation		33		25		66		49
Expected return on plan assets		(38)		(50)		(75)		(99)
Total pension benefit cost / (income)	$	9	$	(5)	$	18	$	(9)

OPEB [Member]

Net Periodic Benefit Cost

	Postretirement
	For the three months ended ‎June 30,				For the six months ended ‎June 30,
($ in millions)	2023		2022		2023		2022
Components of net periodic postretirement benefit cost
Service cost	$	2	$	3	$	4	$	7
Interest cost on projected benefit obligation		7		8		15		14
Amortization of prior service credit (gain) loss recognized		(5)		(3)		(10)		(6)
Remeasurement (gain) loss		(12)		(96)		8		(150)
Total periodic postretirement (benefit) cost	$	(8)	$	(88)	$	17	$	(135)