Investments - Maturities of Available for Sale and Held to Maturity Securities (Details) $ in Millions	Sep. 03, 2017 USD ($)
Available-For-Sale, Cost Basis
Due in one year or less	$ 185
Due after one year through five years	721
Due after five years	42
Available-for-sale, cost basis, total	948
Available-For-Sale, Fair Value
Due in one year or less	185
Due after one year through five years	721
Due after five years	42
Available-for-sale, recorded basis, total	948
Held-To-Maturity
Due in one year or less	285
Due after one year through five years	0
Due after five years	0
Held-to-maturity, cost basis, total	$ 285