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FINANCING ARRANGEMENTS - Maturities and Mandatory Payments, Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 29, 2020 | May 26, 2020 | Jan. 16, 2020 | Mar. 08, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | May 23, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 3,162,000,000 | $ 3,956,000,000 |
Gain on extinguishment of debt |  | $ (27,000,000) |  |  | $ 0 | $ 0 | (51,000,000) | $ (40,000,000) |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased debt, aggregate par value |  |  |  |  | $ 27,000,000 |  | 27,000,000 |  |
Repayments of long-term debt |  |  |  |  |  |  | 26,000,000 |  |
Gain on extinguishment of debt |  |  |  |  |  |  | $ 1,000,000 |  |
Senior Unsecured Notes | 5.875% Senior Notes Due May 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased debt, aggregate par value |  |  |  |  |  |  |  |  | $ 1,118,000,000
Repayments of long-term debt |  |  | $ 1,240,000,000 | $ 584,000,000 |  |  |  |  |
Senior Unsecured Notes | 5.875% Senior Notes Due May 2023 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 99,000,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.50% Senior Notes Due March 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchased debt, aggregate par value |  |  |  |  |  |  |  |  | $ 382,000,000
Repayments of long-term debt |  |  |  | $ 216,000,000 |  |  |  |  |
Senior Unsecured Notes | 5.50% Senior Notes Due March 2023 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 51,000,000 |  |  |  |  |  |  |  |

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