Retirement Benefits

The components of net periodic benefit credit included in our consolidated statements of income for the three months ended September 30, 2018 and 2017 are as follows:



	Pension Benefits						Other Benefits
	Three Months Ended September 30						Three Months Ended September 30
	2018			2017			2018			2017
Service cost	$	2		$	2		$	—		$	—
Interest cost	14			17			4			5
Expected return on assets	(37		)	(37		)	(6		)	(6		)
Recognized actuarial loss	6			5			1			3
Settlement loss	6			3			—			—
Amortization of prior service credit	—			—			(3		)	(3		)
Net periodic benefit credit	$	(9	)	$	(10	)	$	(4	)	$	(1	)

The components of net periodic benefit credit included in our consolidated statements of income for the nine months ended September 30, 2018 and 2017 are as follows:



	Pension Benefits						Other Benefits
	Nine Months Ended September 30						Nine Months Ended September 30
	2018			2017			2018			2017
Service cost	$	6		$	7		$	1		$	1
Interest cost	41			50			11			15
Expected return on assets	(110		)	(111		)	(18		)	(17		)
Recognized actuarial loss	18			16			3			9
Settlement loss	19			7			—			—
Amortization of prior service credit	—			—			(9		)	(10		)
Net periodic benefit credit	$	(26	)	$	(31	)	$	(12	)	$	(2	)

For the year ending December 31, 2018, no material contributions are expected to be necessary to meet the Employee Retirement Income Security Act of 1994, or ERISA, required funding levels; however, we may elect to make discretionary contributions up to the maximum amount deductible for income tax purposes. Contributions of $7 and $0 were made to our retirement benefit plans during the nine months ended September 30, 2018 and 2017, respectively.