Investments - Maturities of Available-for-sale and Held-to-maturity Securities (Details) $ in Millions	May. 08, 2016 USD ($)
Available-for-sale, Cost Basis
Due in one year or less	$ 253
Due after one year through five years	612
Due after five years	46
Available-for-sale, cost basis, total	911
Available-for-sale, Fair Value
Due in one year or less	253
Due after one year through five years	618
Due after five years	48
Available-for-sale, recorded basis, total	919
Held-to-maturity
Due in one year or less	218
Due after one year through five years	0
Due after five years	0
Held-to-maturity, cost basis, total	$ 218