Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Plans [Abstract]

Net Periodic Benefit Cost

	Pension Benefits
	For the three months ended				For the nine months ended
	September 30,				September 30,
($ in millions)	2020		2019		2020		2019
Components of total pension benefit cost
Service cost	$	24	$	21	$	73	$	63
Interest cost on projected benefit obligation		26		33		84		98
Expected return on plan assets		(40)		(43)		(129)		(129)
Amortization of unrecognized loss		29		14		76		42
Net periodic pension benefit cost		39		25		104		74
Pension settlement costs		-		-		159		-
Gain on disposal, net		-		-		(50)		-
Total pension benefit cost	$	39	$	25	$	213	$	74
	Postretirement Benefits
	For the three months ended				For the nine months ended
	September 30,				September 30,
($ in millions)	2020		2019		2020		2019
Components of net periodic postretirement benefit cost
Service cost	$	5	$	4	$	15	$	14
Interest cost on projected benefit obligation		8		10		24		31
Amortization of prior service cost (credit)		(8)		(3)		(24)		(7)
Amortization of unrecognized (gain) loss		1		1		4		(1)
Net periodic postretirement benefit cost		6		12		19		37
Gain on disposal, net		-		-		(24)		-
Total periodic postretirement benefit cost	$	6	$	12	$	(5)	$	37