Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	4 Months Ended
	Jun. 16, 2012	Jun. 18, 2011
Pension Benefits [Member]
Net periodic benefit expense (income) for defined benefit pension plans and other postretirement benefit plans
Service cost	$ 3	$ 3
Interest cost	42	43
Expected return on assets	(45)	(39)
Amortization of prior service benefit
Amortization of net actuarial loss	37	29
Net periodic benefit cost	37	36
Other Postretirement Benefits [Member]
Net periodic benefit expense (income) for defined benefit pension plans and other postretirement benefit plans
Service cost	1	1
Interest cost	1	2
Expected return on assets
Amortization of prior service benefit	(4)	(2)
Amortization of net actuarial loss	2	1
Net periodic benefit cost	$ 0	$ 2