Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		12 Months Ended
	Feb. 21, 2014	Aug. 23, 2011	Feb. 22, 2014 Employees Agreement	Feb. 23, 2013	Feb. 25, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Reduction in postretirement benefit obligation	$ 11	$ 39
Accumulated other Comprehensive loss, net of tax, recognized			257	45	(211)
Actuarial loss			63
Contribution to other postretirement benefits plan			3
Defined benefit plan periodic cost increased in next fiscal year					10
Defined benefit plan assets unrecognized gain loss recognized period			3 years
Assumed healthcare cost trend rate			7.50%
Specified age of employee for post retirement benefit plans			65 years
Assumed healthcare cost trend rate description			The assumed healthcare cost trend rate used in measuring the accumulated postretirement benefit obligation before age 65 was 7.50 percent as of February 22, 2014. The assumed healthcare cost trend rate for retirees before age 65 will decrease by 0.25 percent for each year through fiscal 2026, until it reaches the ultimate trend rate of 4.50 percent. For those retirees whose health plans provide for variable employer contributions, the assumed healthcare cost trend rate used in measuring the accumulated postretirement benefit obligation after age 65 was 6.00 percent as of February 22, 2014. The assumed healthcare cost trend rate for retirees after age 65 will decrease through fiscal 2026, until it reaches the ultimate trend rate of 4.50 percent
Company's service and interest cost would impact due to a 100 basis point change in the trend rate			1
Company's accumulated postretirement benefit obligation would impact due to a 100 basis point decrease in the trend rate			5
Company's accumulated postretirement benefit obligation would impact due to a 100 basis point increase in the trend rate			6
Contribute in excess of minimum required amounts by additional contributions end of fiscal 2015			25
Contribute in excess of minimum required amounts by additional contributions end of fiscal 2016			25
Contribute in excess of minimum required amounts by additional contributions end of fiscal 2017			50
Total contribution expenses of defined contribution plans			11	17	23
Shares in plan assets			3	7
Obligation for post-employment benefits			24
Post-employment benefits included in accrued vacation, compensation and benefits			9
Post-employment benefits included in other liabilities			15
Contribution to Pension Plans			39	38	38
Description of multi-employer plans			Among other factors, red zone status plans are generally less than 65 percent funded and are considered in critical status, plans in yellow zone or orange zone status are less than 80 percent funded and are considered in endangered or seriously endangered status, and green zone plans are at least 80 percent funded
Company's number of employees			35,800
Number of collective bargaining agreements covering employees renegotiated			20
Number of employees renegotiated collective bargaining agreement			8,200
Number of employees expired without renegotiated collective bargaining agreement			100
Number of collective bargaining agreements covering employees expired without renegotiated			2
Number of collective bargaining agreements covering employees expired			23
Red Zone [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maximum percentage of funded status			65.00%
Yellow Zone [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maximum percentage of funded status			80.00%
Green Zone [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maximum percentage of funded status			80.00%
Number of Employees Covered by Collective Bargaining Agreements [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of employees covered by collective bargaining agreements			15,300
Collective Bargaining Agreements Covering Employees Expire Within One Year [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of employee expire collective bargaining agreement			11,800
Shaw Banner [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accumulated other Comprehensive loss, net of tax, recognized				48
Unfunded benefit obligations of divested defined benefit pension plan				108
Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accumulated benefit obligation for the defined benefit pension plans			2,726	2,893
Unfunded benefit obligations of divested defined benefit pension plan			2,726	2,893	2,745
Actuarial loss			141	(119)
Defined benefit plan periodic cost increased					2
Contribution to Pension Plans			118	93
Pension Benefits [Member] | Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to pension plans			130
Pension Benefits [Member] | Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to pension plans			140
Other Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Reduction in postretirement benefit obligation			11
Unfunded benefit obligations of divested defined benefit pension plan			81	109	116
Actuarial loss			12	9
Defined benefit plan periodic cost increased					1
Contribution to Pension Plans			6	5
Multiemployer Postretirement Benefit Plans Other than Pensions [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to Multi-Employer Plans			$ 87	$ 90	$ 90
Retirees Before Age 65 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Assumed healthcare cost trend rate			0.25%
Assumed healthcare cost ultimate trend rate			4.50%
Retirees After Age 65 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Assumed healthcare cost trend rate			6.00%
Assumed healthcare cost ultimate trend rate			4.50%