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DERIVATIVES- Terminated Interest Rate Swaps (Details) $ in Millions | Sep. 15, 2016 USD ($) | Apr. 30, 2019 USD ($) | Oct. 31, 2018 USD ($) | Feb. 01, 2016 USD ($) contracts | Jul. 01, 2012 USD ($) | Aug. 09, 2011 USD ($) contracts
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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 |  | $ 1 |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |
Remaining deferred gain (loss) to be amortized on derivative |  | 5 | $ 7 |  |  |
Senior Notes 2020 |  |  |  |  |  |
Terminated Derivative Contracts |  |  |  |  |  |
Remaining deferred gain (loss) to be amortized on derivative |  | 5 | 7 |  |  |
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 |  | 5 |  |  |  |
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 |  | 1 |  |  |  |
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 |  | $ 7 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 35 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109978511&loc=d3e75592-113984 + Details
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