Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Plans [Abstract]

Net Periodic Benefit Cost

	Pension Benefits
	For the three months ended				For the six months ended
	June 30,				June 30,
($ in millions)	2020		2019		2020		2019
Components of total pension benefit cost
Service cost	$	24	$	21	$	49	$	42
Interest cost on projected benefit obligation		28		32		58		65
Expected return on plan assets		(39)		(43)		(89)		(86)
Amortization of unrecognized loss		30		14		47		28
Net periodic pension benefit cost		43		24		65		49
Pension settlement costs		56		-		159		-
One-time gain on disposal, net		(50)		-		(50)		-
Total pension benefit cost	$	49	$	24	$	174	$	49
	Postretirement Benefits
	For the three months ended				For the six months ended
	June 30,				June 30,
($ in millions)	2020		2019		2020		2019
Components of net periodic postretirement benefit cost
Service cost	$	5	$	5	$	10	$	10
Interest cost on projected benefit obligation		8		11		16		21
Amortization of prior service cost (credit)		(8)		(3)		(16)		(4)
Amortization of unrecognized (gain) loss		1		-		3		(2)
Net periodic postretirement benefit cost		6		13		13		25
One-time gain on disposal, net		(24)		-		(24)		-
Total periodic postretirement benefit cost	$	(18)	$	13	$	(11)	$	25