Pension Plans, Retirement Benefits and Savings Plans (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Summary of the components of net periodic benefit cost for the Company's pension and postretirement benefit plans recognized in the consolidated statement of income [Table Text Block]

The following table summarizes the components of net periodic benefit cost for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income (loss) for the three months ended June 30, 2020 and 2019.

	Pension Plans				Postretirement Benefit Plans
(for the three months ended June 30, in millions)	2020		2019		2020		2019
Net Periodic Benefit Cost:
Service cost	$	33	$	29	$	—	$	—
Non-service cost (benefit):
Interest cost on benefit obligation	$	28	$	35	$	1	$	2
Expected return on plan assets	(68)		(68)		—		—
Amortization of unrecognized:
Prior service benefit	—		(1)		—		(1)
Net actuarial (gain) loss	23		14		(1)		—
Total non-service cost (benefit)	(17)		(20)		—		1
Net periodic benefit cost	$	16	$	9	$	—	$	1

The following table summarizes the components of net periodic benefit cost for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income (loss) for the six months ended June 30, 2020 and 2019.

	Pension Plans				Postretirement Benefit Plans
(for the six months ended June 30, in millions)	2020		2019		2020		2019
Net Periodic Benefit Cost:
Service cost	$	66	$	59	$	—	$	—
Non-service cost (benefit):
Interest cost on benefit obligation	57		70		2		4
Expected return on plan assets	(137)		(137)		—		—
Amortization of unrecognized:
Prior service benefit	—		(1)		(2)		(2)
Net actuarial (gain) loss	46		28		(1)		—
Total non-service cost (benefit)	(34)		(40)		(1)		2
Net periodic benefit cost (benefit)	$	32	$	19	$	(1)	$	2

Consolidated statement of income line items impacted by service costs and non-service benefit costs [Table Text Block]

The following table indicates the line items in which the respective service cost and non-service cost (benefit) are presented in the consolidated statement of income (loss) for the three months ended June 30, 2020 and 2019.

	Pension Plans				Postretirement Benefit Plans
(for the three months ended June 30, in millions)	2020		2019		2020		2019
Service Cost:
Claims and claim adjustment expenses	$	14	$	12	$	—	$	—
General and administrative expenses	19		17		—		—
Total service cost	33		29		—		—
Non-Service Cost (Benefit):
Claims and claim adjustment expenses	(7)		(8)		—		1
General and administrative expenses	(10)		(12)		—		—
Total non-service cost (benefit)	(17)		(20)		—		1
Net periodic benefit cost	$	16	$	9	$	—	$	1

The following table indicates the line items in which the respective service costs and non-service benefit costs are presented in the consolidated statement of income (loss) for the six months ended June 30, 2020 and 2019.

	Pension Plans				Postretirement Benefit Plans
(for the six months ended June 30, in millions)	2020		2019		2020		2019
Service Cost:
Claims and claim adjustment expenses	$	28	$	24	$	—	$	—
General and administrative expenses	38		35		—		—
Total service cost	66		59		—		—
Non-Service Cost (Benefit):
Claims and claim adjustment expenses	(14)		(16)		—		1
General and administrative expenses	(20)		(24)		(1)		1
Total non-service cost (benefit)	(34)		(40)		(1)		2
Net periodic benefit cost (benefit)	$	32	$	19	$	(1)	$	2