Investments - Available-for-sale and Held-to-maturity Investments (Detail) $ in Millions	6 Months Ended
	Feb. 18, 2018 USD ($)	Feb. 17, 2019 USD ($) warehouse	Sep. 02, 2018 USD ($)
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, recorded basis		$ 884
Available-for-sale, cost basis, total		892
Held-to-maturity, cost basis		158
Total investments, recorded basis		$ 1,042	$ 1,204
Proceeds from Sale of Available-for-sale Securities	$ 39
Number of Stores | warehouse		769
Short-term Investments
Available-for-sale and Held-to-maturity [Line Items]
Unrealized gains/(loss), net		$ (8)	(14)
Total investments, recorded basis		1,042	1,204
Total investments, cost basis, total		1,050	1,218
Short-term Investments | Government and Agency Securities
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, recorded basis		884	898
Available-for-sale Securities [Member] | Short-term Investments
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, recorded basis		884
Unrealized gains/(loss), net		(8)
Available-for-sale, cost basis, total		892
Available-for-sale Securities [Member] | Short-term Investments | Government and Agency Securities
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, recorded basis		884	898
Unrealized gains/(loss), net		(8)	(14)
Available-for-sale, cost basis, total		892	912
Held-to-maturity Securities [Member] | Short-term Investments
Available-for-sale and Held-to-maturity [Line Items]
Held-to-maturity, recorded basis		158
Held-to-maturity, cost basis		158
Held-to-maturity Securities [Member] | Short-term Investments | Certificates of deposit
Available-for-sale and Held-to-maturity [Line Items]
Held-to-maturity, recorded basis		158	306
Held-to-maturity, cost basis		$ 158	$ 306