Postretirement benefits (Tables)

6 Months Ended

Jun. 30, 2016

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Assumptions Used [Table Text Block]

The weighted-average assumptions used to determine net pension and other postretirement benefit costs were as follows:

	Pension Benefits				Other Postretirement Benefits
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
June 30, 2016
Discount rate	4.28	%	3.74	%	4.41	%	4.30	%
Rate of compensation increase	4.00	%	3.40	%	N/A		N/A
Expected long-term rate of return on plan assets	7.00	%	4.90	%	7.00	%	N/A
December 31, 2015
Discount rate	N/A		3.51	%	N/A		N/A
Rate of compensation increase	N/A		3.09	%	N/A		N/A
Expected long-term rate of return on plan assets	N/A		4.81	%	N/A		N/A

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

	Pension Benefits									Other Postretirement Benefits
January 14, 2016	U.S. Plans			Non-U.S. Plans			Total			U.S. Plans			Non-U.S. Plans			Total
(in millions of U.S. dollars)
Fair value of plan assets	$	2,473		$	315		$	2,788		$	138		$	—		$	138
Benefit obligations	(3,153		)	(372		)	(3,525		)	(491		)	(15		)	(506		)
Funded status	$	(680	)	$	(57	)	$	(737	)	$	(353	)	$	(15	)	$	(368	)

Schedule of Net Benefit Costs [Table Text Block]

The following tables summarize the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the Consolidated statements of operations:

Three Months Ended June 30	Pension Benefits									Other Postretirement Benefits
(in millions of U.S. dollars)	U.S. Plans			Non-U.S. Plans			Total			U.S. Plans			Non-U.S. Plans		Total
2016
Net periodic benefit cost:
Service cost	$	20		$	4		$	24		$	2		$	1	$	3
Interest cost	27			8			35			4			—		4
Expected return on plan assets	(42		)	(10		)	(52		)	(2		)	—		(2		)
Amortization of net actuarial loss	—			1			1			—			—		—
Net periodic benefit cost	$	5		$	3		$	8		$	4		$	1	$	5
2015
Net periodic benefit cost:
Service cost	$	—		$	1		$	1
Interest cost	—			5			5
Expected return on plan assets	—			(7		)	(7		)
Amortization of net actuarial loss	—			1			1
Net periodic benefit cost	$	—		$	—		$	—

Six Months Ended June 30	Pension Benefits									Other Postretirement Benefits
(in millions of U.S. dollars)	U.S. Plans			Non-U.S. Plans			Total			U.S. Plans			Non-U.S. Plans		Total
2016
Net periodic benefit cost:
Service cost	$	37		$	9		$	46		$	4		$	1	$	5
Interest cost	54			16			70			9			—		9
Expected return on plan assets	(79		)	(20		)	(99		)	(4		)	—		(4		)
Amortization of net actuarial loss	—			2			2			—			—		—
Net periodic benefit cost	$	12		$	7		$	19		$	9		$	1	$	10
2015
Net periodic benefit cost:
Service cost	$	—		$	3		$	3
Interest cost	—			10			10
Expected return on plan assets	—			(14		)	(14		)
Amortization of net actuarial loss	—			2			2
Net periodic benefit cost	$	—		$	1		$	1