DERIVATIVES- Terminated Interest Rate Swaps (Details) $ in Millions	Sep. 15, 2016 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Feb. 01, 2016 USD ($) contracts	Jul. 01, 2012 USD ($)	Aug. 09, 2011 USD ($) contracts
Derivative Instruments and Hedging Activities Disclosure
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a net liability position		$ 10
Terminated Derivative Contracts
Remaining deferred gain (loss) to be amortized on derivative		10	$ 11
Senior Notes 2020
Terminated Derivative Contracts
Remaining deferred gain (loss) to be amortized on derivative		10	11
Senior Notes 2020 | Interest Rate Swap [Member] | Derivatives Designated as Hedging Instrument | Fair Value Hedging
Terminated Derivative Contracts
Number of interest rate swap contracts terminated | contracts						5
Notional amount of contract						$ 500
Remaining deferred gain (loss) to be amortized on derivative		10
Senior Notes 2022
Terminated Derivative Contracts
Remaining deferred gain (loss) to be amortized on derivative		0	0
Senior Notes 2022 | Treasury Lock [Member] | Derivatives Designated as Hedging Instrument | Cash Flow Hedging
Terminated Derivative Contracts
Notional amount of contract					$ 400
Remaining gain (loss) to be amortized on derivative		2
Senior Notes 2026
Terminated Derivative Contracts
Remaining deferred gain (loss) to be amortized on derivative		0	$ 0
Senior Notes 2026 | Interest Rate Swap [Member] | Derivatives Designated as Hedging Instrument | Cash Flow Hedging
Terminated Derivative Contracts
Number of interest rate swap contracts terminated | contracts				3
Notional amount of contract				$ 300
Interest rate swap payments	$ 10
Remaining gain (loss) to be amortized on derivative		$ 8