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DEBT (Senior Notes Offering) (Details) - USD ($) | Jun. 30, 2020 | May 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Discount | $ 11,000,000 |  |
Long-term debt | $ 4,575,000,000 |  | $ 4,770,000,000
Senior Notes | 2.80% Senior Notes due June 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount |  | $ 550,000,000 |
Debt instrument, interest rate | 2.80% | 2.80% |
Discount |  | $ 1,000,000 |
Debt issuance costs |  | $ 5,000,000 |
Long-term debt | $ 549,000,000 |  | 0
Senior Notes | 4.70% Senior Notes due April 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 4.70% |  |
Long-term debt | $ 552,000,000 |  | $ 554,000,000
Senior Notes | 4.70% Senior Notes due April 2021 | Plan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 550,000,000 |  |

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