Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 25, 2012 Agreement Person Employee	Feb. 26, 2011	Feb. 27, 2010
Benefit Plans (Textual) [Abstract]
Assumed healthcare cost trend rate	7.75%
Contribution to Pension Plans	$ 130	$ 135	$ 143
Contribution to Multi-Employer Plans	130	135	143
Benefit Plans (Additional Textual) [Abstract]
Ultimate healthcare cost trend rate used in measuring the accumulated postretirement benefit obligation	5.00%
Postretirement benefit obligation, Year that rate reaches ultimate trend rate	2019
Reduction in postretirement benefit obligation	39
Total contribution expenses of defined contribution plans	81	94	95
Shares in plan assets	5	4
Obligation for post-employment benefits	44
Post-employment benefits included in accrued vacation, compensation and benefits	22
Post-employment benefits included in other liabilities	22
Defined benefit plan periodic cost increased in next fiscal year	2
Description of multi-employer plans	Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	The assumed healthcare cost trend rate for retirees before and after age 65 will decrease by 0.25 percent for each of the next five years, through fiscal 2018, 0.50 percent in fiscal 2018, and 1.0 percent in fiscal 2019, until it reaches the ultimate trend rate of 5.0 percent.
Multiemployer plan, significant changes affecting the period-to-period comparability	The number of employees covered by the Company's multiemployer plans decreased by 5 percent from 2011 to 2012 and by 17 percent from 2010 to 2011, affecting the period-to-period comparability of the contributions for years 2012, 2011 and 2010. The significant reduction in covered employees corresponded to a reduction in overall business.
Percentage decrease of multiemployer plans	5.00%	17.00%
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	10
Company's accumulated postretirement benefit obligation would impact due to a 100 basis point increase in the trend rate	11
Company's number of employees	130,000
Number of collective bargaining agreements covering employees renegotiated	56
Number of Employees Renegotiated Collective Bargaining Agreement	38,000
Number of employees expired without renegotiated collective bargaining agreement	5,500
Number of collective bargaining agreements covering employees expired without renegotiated	32
Number of collective bargaining agreements covering employees expired	76
Number of Employees covered by collective bargaining agreements [Member]
Benefit Plans (Textual) [Abstract]
Number of employees covered by collective bargaining agreements	84,000
Collective bargaining agreements covering employees expire within one year [Member]
Benefit Plans (Textual) [Abstract]
Number of employees expire collective bargaining agreement	36,000
Maximum [Member]
Benefit Plans (Textual) [Abstract]
Percentage representing PPA surcharges	10.00%
Minimum [Member]
Benefit Plans (Textual) [Abstract]
Percentage representing PPA surcharges	5.00%
Pension Benefits [Member]
Benefit Plans (Textual) [Abstract]
Accumulated benefit obligation for the defined benefit pension plans	3,028	2,500
Amortization of net actuarial loss	461	146
Defined benefit plan periodic cost increased	10
Contribution to Pension Plans	87	163
Other Postretirement Benefits [Member]
Benefit Plans (Textual) [Abstract]
Amortization of net actuarial loss	17	13
Amortization of prior service benefit	(9)	(6)	(6)
Defined benefit plan periodic cost increased	1
Assumed healthcare cost trend rate, 2013	0.25%
Assumed healthcare cost trend rate, 2014	0.25%
Assumed healthcare cost trend rate, 2015	0.25%
Assumed healthcare cost trend rate, 2016	0.25%
Assumed healthcare cost trend rate, 2017	0.25%
Assumed healthcare cost trend rate, 2018	0.25%
Assumed healthcare cost trend rate, 2019	0.50%
Assumed healthcare cost trend rate, 2020	1.00%
Contribution to Pension Plans	6	6
Contribution to other postretirement benefits plan	7
Benefit Plans (Additional Textual) [Abstract]
Reduction in postretirement benefit obligation	(52)
Multiemployer Postretirement Benefit Plans Other than Pensions [Member]
Benefit Plans (Textual) [Abstract]
Contribution to Multi-Employer Plans	$ 364	$ 375	$ 358
Red Zone [Member]
Benefit Plans (Textual) [Abstract]
Maximum percentage of funded status	65.00%
Yellow Zone [Member]
Benefit Plans (Textual) [Abstract]
Maximum percentage of funded status	80.00%
Green Zone [Member]
Benefit Plans (Textual) [Abstract]
Maximum percentage of funded status	80.00%