Recently Adopted and Issued Accounting Standards Schedule of Effect of Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 08, 2018	Sep. 09, 2017	Sep. 08, 2018	Sep. 09, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling and administrative expenses	$ 356	$ 323	$ 784	$ 710
Operating Income (Loss)	(62)	17	(62)	61
Net periodic benefit income, excluding service cost	$ (9)	(12)	$ (21)	(29)
Previous Accounting Guidance [Member] | Selling, General and Administrative Expenses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		311		681
Previous Accounting Guidance [Member] | Operating Income (Loss) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		29		90
Previous Accounting Guidance [Member] | Other Operating Income (Expense) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit income, excluding service cost		0		0
Adjustments for New Accounting Pronouncement [Member] | Selling, General and Administrative Expenses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		12		29
Adjustments for New Accounting Pronouncement [Member] | Operating Income (Loss) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		(12)		(29)
Adjustments for New Accounting Pronouncement [Member] | Other Operating Income (Expense) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit income, excluding service cost		$ 12		$ 29