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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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