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DERIVATIVES- Terminated Interest Rate Swaps (Details) $ in Millions | Sep. 15, 2016 USD ($) | Oct. 20, 2014 USD ($) | Jul. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Feb. 01, 2016 USD ($) contracts | Jul. 01, 2012 USD ($) | Aug. 09, 2011 USD ($) contracts | Nov. 25, 2008 USD ($) contracts | Oct. 24, 2007 USD ($)
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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 |  |  | $ 5 |  |  |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |  |  |  |
Remaining deferred gain (loss) to be amortized on derivative |  |  | 12 | $ 16 |  |  |  |  |
Senior Notes 2017 |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |  |  |  |  |  |
Aggregate face amount |  | $ 600 | 100 |  |  |  |  |  | $ 600
Amount of extinguishment of debt |  | $ 500 |  |  |  |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |  |  |  |
Remaining deferred gain (loss) to be amortized on derivative |  |  | 0 | 1 |  |  |  |  |
Senior Notes 2017 | Interest Rate Swap [Member] | Derivatives Designated as Hedging Instrument | Fair Value Hedging |  |  |  |  |  |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |  |  |  |
Number of interest rate swap contracts terminated | contracts |  |  |  |  |  |  |  | 2 |
Notional amount of contract |  |  |  |  |  |  |  | $ 400 |
Senior Notes 2020 |  |  |  |  |  |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |  |  |  |
Remaining deferred gain (loss) to be amortized on derivative |  |  | 12 | 15 |  |  |  |  |
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 |  |  | 12 |  |  |  |  |  |
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 |  |  | $ 9 |  |  |  |  |  |

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