Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Components of Pretax Net Periodic Benefit Costs

The components of our pretax net periodic benefit costs for our significant qualified defined benefit and retiree medical and life insurance plans were as follows (in millions):

	Quarters Ended
	March 31,   2013		March 25,       2012
Qualified defined benefit pension plans
Service cost		$    286		$    264
Interest cost		450		471
Expected return on plan assets		(622)		(547)
Recognized net actuarial losses		353		279
Amortization of prior service cost		20		18
Total net periodic benefit cost		$     487		$    485
Retiree medical and life insurance plans
Service cost		$         7		$        7
Interest cost		29		33
Expected return on plan assets		(36)		(33)
Recognized net actuarial losses		11		8
Amortization of prior service credit		(5)		(3)
Total net periodic benefit cost		$         6		$      12