The components of net periodic benefit costs for our non-contributory qualified defined benefit pension plan (primary plan) and non-contributory supplemental pension plans for the three months ended April 30, 2011 and May 1, 2010 were as follows:

 

	Pension Plans
		Primary Plan						Supplemental						Total
($ in millions)		Three Months Ended						Three Months Ended						Three Months Ended
		April 30,			May 1,			April 30,			May 1,			April 30,			May 1,
		2011			2010			2011			2010			2011			2010
Service cost	$	22		$	22		$	1		$	1		$	23		$	23
Interest cost		62			62			3			4			65			66
Expected return on plan assets		(96	)		(88	)		-			-			(96	)		(88	)
Net amortization		34			59			3			4			37			63
Net periodic benefit expense	$	22		$	55		$	7		$	9		$	29		$	64

 

 

The components of the net periodic benefit of our contributory postretirement health and welfare plan were predominantly included in SG&A expenses on the Consolidated Statements of Operations and were as follows:

				Postretirement Health and Welfare Plan
($ in millions)				Three Months Ended
				April 30,			May 1,
				2011			2010
Service cost		$		-		$	-
Interest cost				-			-
Expected return on plan assets				-			-
Net amortization				(6	)		(6	)
Net periodic (income)		$		(6	)	$	(6	)

 

Defined Contribution Plans

Our defined contribution plans include a qualified Savings, Profit-Sharing and Stock Ownership Plan (401(k) plan), which includes a non-contributory retirement account, and a non-qualified contributory unfunded mirror savings plan offered to certain management associates. Total expense for our defined contribution plans for the first quarters of 2011 and 2010 was $16 million and $14 million, respectively, and was predominantly included in SG&A expenses on the Consolidated Statements of Operations.