Pension Plans, Retirement Benefits and Savings Plans (tables)

9 Months Ended

Sep. 30, 2017

Pension Plans, Retirement Benefits and Savings Plans disclosure

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]

(for the three months ended	Pension Plans						Postretirement Benefit Plans
September 30, in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	30		$	29		$	—		$	—
Non-service cost:
Interest cost on benefit obligation	35			30			2			2
Expected return on plan assets	(60		)	(57		)	—			—
Settlement	—			—			—			—
Amortization of unrecognized:
Prior service benefit	(1		)	—			(1		)	(1		)
Net actuarial loss	29			17			—			—
Total non-service cost (benefit)	3			(10		)	1			1
Net periodic benefit cost	$	33		$	19		$	1		$	1

(for the nine months ended	Pension Plans						Postretirement Benefit Plans
September 30, in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	90		$	88		$	—		$	—
Non-service cost:
Interest cost on benefit obligation	96			91			5			6
Expected return on plan assets	(180		)	(172		)	—			—
Settlement	—			1			—			—
Amortization of unrecognized:
Prior service benefit	(1		)	—			(3		)	(3		)
Net actuarial loss	66			50			—			—
Total non-service cost (benefit)	(19		)	(30		)	2			3
Net periodic benefit cost	$	71		$	58		$	2		$	3

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

(for the three months ended	Pension Plans					Postretirement Benefit Plans
September 30, in millions)	2017		2016			2017		2016
Service Cost:
Claims and claim adjustment expenses	$	13	$	12		$	—	$	—
General and administrative expenses	17		17			—		—
Total service cost	30		29			—		—
Non-Service Cost:
Claims and claim adjustment expenses	1		(4		)	1		—
General and administrative expenses	2		(6		)	—		1
Total non-service cost (benefit)	3		(10		)	1		1
Net periodic benefit cost	$	33	$	19		$	1	$	1

(for the nine months ended	Pension Plans						Postretirement Benefit Plans
September 30, in millions)	2017			2016			2017		2016
Service Cost:
Claims and claim adjustment expenses	$	37		$	36		$	—	$	—
General and administrative expenses	53			52			—		—
Total service cost	90			88			—		—
Non-Service Cost:
Claims and claim adjustment expenses	(8		)	(13		)	1		1
General and administrative expenses	(11		)	(17		)	1		2
Total non-service cost (benefit)	(19		)	(30		)	2		3
Net periodic benefit cost	$	71		$	58		$	2	$	3