OTHER INCOME, NET

Other income (expense), net included:



	Year Ended December 31,
	2018			2017			2016
	(in millions)
Interest income	$	21		$	7		$	1
Loss on extinguishment of debt	—			—			(73		)
Components of net periodic benefit cost other than service cost	(18		)	(32		)	(18		)
Reserve for Unsecured Creditors litigation	—			(10		)	(300		)
Costs associated with acquisitions	(14		)	(8		)	—
Contingent consideration liability fair value adjustment	(23		)	14			(3		)
Other, net	36			8			9
Other income (expense), net	$	2		$	(21	)	$	(384	)

During the year ended December 31, 2018, Aptiv incurred approximately $18 million in transaction costs related to the acquisitions of KUM and Winchester and, as further discussed in Note 17. Derivatives and Hedging Activities, recorded a gain of $4 million on forward contracts entered into in order to hedge portions of the currency risk associated with the cash payment for the acquisition of KUM, which are reflected within costs associated with acquisitions in the above table. Additionally, as further discussed in Note 25. Discontinued Operations, during the year ended December 31, 2018, Aptiv recorded $11 million for certain fees earned pursuant to the transition services agreement in connection with the Separation of the Company’s former Powertrain Systems segment.

As further discussed in Note 13. Commitments and Contingencies, during the three months ended June 30, 2017, Aptiv and the plaintiffs reached an agreement to settle the Unsecured Creditors litigation for $310 million, which was subsequently approved by the Bankruptcy Court. In July 2017, the Company paid the $310 million settlement pursuant to the terms of the settlement agreement. In accordance with the terms of the settlement agreement, the Company recorded a net incremental charge of $10 million to its previously recorded reserve of $300 million to other expense during the year ended December 31, 2017. Also during the year ended December 31, 2017, Aptiv incurred approximately $8 million in transaction costs related to the acquisition of nuTonomy.

During the year ended December 31, 2016, Aptiv recorded a reserve of $300 million for the Unsecured Creditors litigation. As further discussed in Note 11. Debt, during the year ended December 31, 2016, Aptiv redeemed for cash the entire $800 million aggregate principal amount outstanding of the 2013 Senior Notes, resulting in a loss on debt extinguishment of approximately $70 million. Aptiv also recorded a loss on debt extinguishment of $3 million during the year ended December 31, 2016 in conjunction with the 2016 amendment to the Credit Agreement, as further discussed in Note 11. Debt. Additionally, as further discussed in Note 25. Discontinued Operations, during the year ended December 31, 2016, Aptiv recorded $8 million for certain fees earned pursuant to the transition services agreement in connection with the sale of the Company’s wholly owned Thermal Systems business.