Pension Plans, Retirement Benefits and Savings Plans (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Summary of the components of net periodic benefit cost (benefit) 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 (benefit) for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income for the three months ended March 31, 2024 and 2023.

	Pension Plans				Postretirement Benefit Plans
(for the three months ended March 31, in millions)	2024		2023		2024		2023
Net Periodic Benefit Cost (Benefit):
Service cost	$	29	$	27	$	—	$	—
Non-service cost (benefit):
Interest cost on benefit obligation	43		44		1		1
Expected return on plan assets	(75)		(78)		—		—
Amortization of unrecognized:
Prior service benefit	—		—		(1)		(1)
Net actuarial (gain) loss	2		—		(2)		(2)
Total non-service cost (benefit)	(30)		(34)		(2)		(2)
Net periodic benefit cost (benefit)	$	(1)	$	(7)	$	(2)	$	(2)

Consolidated statement of income line items impacted by service costs and non-service cost (benefit) [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 for the three months ended March 31, 2024 and 2023.

 

	Pension Plans				Postretirement Benefit Plans
(for the three months ended March 31, in millions)	2024		2023		2024		2023
Service Cost:
Claims and claim adjustment expenses	$	11	$	11	$	—	$	—
General and administrative expenses	18		16		—		—
Total service cost	29		27		—		—
Non-Service Cost (Benefit):
Claims and claim adjustment expenses	(12)		(14)		(1)		(1)
General and administrative expenses	(18)		(20)		(1)		(1)
Total non-service cost (benefit)	(30)		(34)		(2)		(2)
Net periodic benefit cost (benefit)	$	(1)	$	(7)	$	(2)	$	(2)