Recently Adopted and Issued Accounting Standards Schedule of Effect of Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions	4 Months Ended
	Jun. 16, 2018	Jun. 17, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Nonoperating Income (Expense)	$ 12	$ 17
Selling, General and Administrative Expenses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		387
Operating Income (Loss) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		44
Other Operating Income (Expense) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Nonoperating Income (Expense)		17
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)		370
Previous Accounting Guidance [Member] | Operating Income (Loss) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit expense (income)		61
Previous Accounting Guidance [Member] | Other Operating Income (Expense) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Nonoperating Income (Expense)		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)		17
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)		(17)
Adjustments for New Accounting Pronouncement [Member] | Other Operating Income (Expense) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Nonoperating Income (Expense)		$ 17