Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Components of net cost of defined benefit plans

The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost of such plans consisted of the following components: 

	Three Months Ended September 30,								Nine Months Ended September 30,
	2020				2019				2020				2019
($ in millions)	U.S.		International		U.S.		International		U.S.		International		U.S.		International
Service cost	$	96	$	77	$	76	$	58	$	270	$	225	$	221	$	178
Interest cost	107		35		115		44		323		103		343		133
Expected return on plan assets	(193)		(104)		(202)		(106)		(581)		(310)		(613)		(320)
Amortization of unrecognized prior service credit	(12)		(3)		(12)		(3)		(37)		(9)		(37)		(9)
Net loss amortization	75		32		43		16		228		94		113		47
Termination benefits	1		1		3		—		5		2		7		1
Curtailments	1		—		5		—		4		(1)		6		—
Settlements	2		—		—		—		11		2		—		—
	$	77	$	38	$	28	$	9	$	223	$	106	$	40	$	30

Other Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Components of net cost of defined benefit plans

The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net credit of such plans consisted of the following components: 

	Three Months Ended September 30,				Nine Months Ended September 30,
($ in millions)	2020		2019		2020		2019
Service cost	$	13	$	12	$	39	$	36
Interest cost	14		17		43		52
Expected return on plan assets	(19)		(18)		(56)		(54)
Amortization of unrecognized prior service credit	(18)		(20)		(54)		(59)
Net gain amortization	(5)		(3)		(13)		(7)
Termination benefits	—		1		—		1
Curtailments	—		(3)		(1)		(4)
	$	(15)	$	(14)	$	(42)	$	(35)