Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 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   June 30,												Six Months Ended   June 30,
	2020						2019						2020						2019
($ in millions)	U.S.			International			U.S.			International			U.S.			International			U.S.			International
Service cost	$	88		$	74		$	74		$	60		$	175		$	148		$	144		$	120
Interest cost	109			33			113			44			217			68			228			89
Expected return on plan assets	(195		)	(101		)	(205		)	(107		)	(388		)	(205		)	(411		)	(214		)
Amortization of unrecognized prior service credit	(12		)	(3		)	(12		)	(3		)	(25		)	(6		)	(25		)	(6		)
Net loss amortization	76			31			35			16			152			62			70			31
Termination benefits	1			—			3			1			4			1			5			1
Curtailments	—			—			—			—			2			(1		)	1			—
Settlements	9			2			—			—			9			2			—			—
	$	76		$	36		$	8		$	11		$	146		$	69		$	12		$	21

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   June 30,						Six Months Ended   June 30,
($ in millions)	2020			2019			2020			2019
Service cost	$	13		$	12		$	26		$	24
Interest cost	14			18			29			35
Expected return on plan assets	(19		)	(18		)	(37		)	(36		)
Amortization of unrecognized prior service credit	(22		)	(21		)	(45		)	(43		)
Curtailments	—			(1		)	(1		)	(1		)
	$	(14	)	$	(10	)	$	(28	)	$	(21	)