NEW ACCOUNTING PRONOUNCEMENTS - Balance Sheet (Details) - USD ($) $ in Millions	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Nov. 01, 2015	Oct. 31, 2015
Cumulative effect adjustment to retained earnings				$ 195
Other assets	$ 459				$ 292
Other accrued liabilities	167				218
Other long-term liabilities	356				414
Additional paid-in-capital	9,144				9,045
Retained earnings	$ 6,000				$ 5,581
As Previously Reported
Other assets		$ 339	$ 242
Other accrued liabilities		188	169
Other long-term liabilities		446	412
Additional paid-in-capital		9,103	9,085
Retained earnings		5,720	5,666
As Adjusted
Other assets		436	353
Other accrued liabilities		187	168
Other long-term liabilities		347	329
Additional paid-in-capital		9,107	9,087
Retained earnings		$ 5,913	$ 5,859
retained earnings due to minimum statutory requirements [Member]
Cumulative effect adjustment to retained earnings				$ 0