FAIR VALUE MEASUREMENTS (Details 3) $ in Millions	Jul. 31, 2015 USD ($)
Contractual Maturities of Debt Securities, Amortized Cost
Amortized cost, due in one year or less	$ 39
Amortized cost, due after one through five years	85
Amortized cost, due after five through 10 years	92
Amortized cost, due after 10 years	38
Amortized cost, mortgage-backed securities	113
Amortized cost, debt securities	367
Contractual Maturities of Debt Securities, Fair Value
Fair value, due in one year or less	40
Fair value, due after one through five years	88
Fair value, due after five through 10 years	95
Fair value, due after 10 years	40
Fair value, mortgage-backed securities	115
Fair value, debt securities	$ 378