Postretirement benefits (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

he components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:

	Three Months Ended March 31
	Pension Benefits									Other Postretirement Benefits
	U.S. Plans			Non-U.S. Plans			Total			U.S. Plans			Non-U.S. Plans		Total
(in millions of U.S. dollars)
2017
Service cost	$	16		$	4		$	20		$	—		$	—	$	—
Interest cost	26			7			33			1			—		1
Expected return on plan assets	(47		)	(10		)	(57		)	(1		)	—		(1		)
Amortization of prior service cost	—			—			—			(23		)	—		(23		)
Net periodic (benefit) cost	$	(5	)	$	1		$	(4	)	$	(23	)	$	—	$	(23	)
2016
Service cost	$	17		$	5		$	22		$	2		$	—	$	2
Interest cost	27			8			35			5			—		5
Expected return on plan assets	(37		)	(10		)	(47		)	(2		)	—		(2		)
Amortization of net actuarial loss	—			1			1			—			—		—
Net periodic cost	$	7		$	4		$	11		$	5		$	—	$	5