RETIREMENT BENEFITS

The cost to the company of its defined benefit retirement plans are shown in the following table:



	Three Months Ended June 30												Six Months Ended June 30
	Pension Benefits						Medical and Life Benefits						Pension Benefits						Medical and Life Benefits
$ in millions	2014			2013			2014			2013			2014			2013			2014			2013
Components of net periodic benefit cost
Service cost	$	115		$	129		$	9		$	9		$	229		$	258		$	17		$	18
Interest cost	315			280			24			24			630			559			50			48
Expected return on plan assets	(468		)	(452		)	(21		)	(19		)	(935		)	(905		)	(42		)	(38		)
Amortization of:
Prior service credit	(15		)	(15		)	(13		)	(13		)	(30		)	(29		)	(20		)	(25		)
Net loss from previous years	82			152			4			8			164			304			6			15
Net periodic benefit cost	$	29		$	94		$	3		$	9		$	58		$	187		$	11		$	18

Employer Contributions

We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006. For the six months ended June 30, 2014, we made contributions of $39 million and $26 million to the company’s defined benefit pension plans and post-retirement benefit plans, respectively.

The company also sponsors defined contribution plans. For the three months ended June 30, 2014 and 2013, we made contributions of $74 million and $75 million, respectively, to these plans. For the six months ended June 30, 2014 and 2013, we made contributions of $147 million and $150 million, respectively, to these plans.