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SHORT-TERM DEBT - Senior Notes (Details) - USD ($) $ in Millions	Sep. 17, 2019	Nov. 01, 2017	Oct. 20, 2014	Aug. 09, 2011	Jul. 13, 2010	Oct. 24, 2007	Sep. 15, 2016
Short-term Debt [Line Items]
Notional Amount Of Terminated Interest Rate Fair Value Hedge Derivatives							$ 10
Senior Notes 2017 [Member]
Short-term Debt [Line Items]
Issuance date of debt						Oct. 24, 2007
Debt Instrument, Face Amount						$ 600
Debt Instrument, Redemption Period, Start Date			Oct. 20, 2014
Extinguishment of Debt, Amount			$ 500
Repayments of senior debt		$ 100
Senior Notes 2020 [Member]
Short-term Debt [Line Items]
Issuance date of debt					Jul. 13, 2010
Debt Instrument, Face Amount				$ 500	$ 500
Percentage Of Face Amount Of Senior Note Instrument Issued					99.54%
Maturity date					Jul. 15, 2020
Fixed interest rate per annum (in hundredths)					5.00%
Debt Instrument, Redemption Period, End Date	Sep. 17, 2019
Early Repayment of Senior Debt	$ 500
Early repayment of senior notes including prepayment penalty	512
Early repayment of senior notes prepayment penalty	12
accelerated amortization of interest rate swap gain	4
Amortization of Debt Issuance Costs and Discounts	1
Debt Instrument, Increase, Accrued Interest	$ 4
Senior Notes 2020 [Member]
Short-term Debt [Line Items]
Interest Rate Derivatives Terminated Date				Aug. 09, 2011
Notional Amount Of Terminated Interest Rate Fair Value Hedge Derivatives				$ 500
Terminated Interest Rate Fair Value Hedge Derivative Assets At Fair Value				$ 34

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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