Employee Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The costs of the Company's defined benefit pension plans and other postretirement benefit plans for the three and six months ended June 30, 2020 and 2019, were as follows:

	Three Months Ended June 30								Six Months Ended June 30
	Pension Benefits				Other Benefits				Pension Benefits				Other Benefits
($ in millions)	2020		2019		2020		2019		2020		2019		2020		2019
Components of Net Periodic Benefit Cost
Service cost	$	45	$	36	$	3	$	1	$	90	$	72	$	5	$	3
Interest cost	65		70		4		5		129		139		8		10
Expected return on plan assets	(122)		(101)		—		—		(243)		(203)		—		—
Amortization of prior service cost (credit)	3		4		(6)		(6)		6		9		(11)		(11)
Amortization of net actuarial loss (gain)	27		28		(1)		(2)		54		56		(3)		(5)
Net periodic benefit cost	$	18	$	37	$	—	$	(2)	$	36	$	73	$	(1)	$	(3)

Schedule of Defined Benefit Plans Disclosures, Cash Contributions

The Company made the following contributions to its defined benefit pension plans and other postretirement benefit plans for the six months ended June 30, 2020 and 2019:

	Six Months Ended June 30
($ in millions)	2020		2019
Pension plans
Qualified minimum	$	—	$	—
Discretionary
Qualified	65		5
Non-qualified	4		3
Other benefit plans	17		16
Total contributions	$	86	$	24