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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 08, 2021 | May 26, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption price percentage to change in control (as a percent) |  |  |  |  | 101.00% |
Repayments of long-term debt |  |  |  |  | $ 3,200,000,000 | $ 3,162,000,000
Loss on extinguishment of debt | $ 38,000,000 | $ 27,000,000 | $ 12,000,000 | $ 0 | $ 62,000,000 | $ 51,000,000
Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption price percentage to change in control (as a percent) |  |  |  |  | 101.00% |
4.875% Senior Notes Due June 2028 | Senior Secured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate on debt (as a percent) | 4.875% |  | 4.875% |  | 4.875% |
Principal amount | $ 1,600,000,000 |  |  |  |  |
4.875% Senior Notes Due June 2028 | Senior Secured Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |
4.875% Senior Notes Due June 2028 | Senior Secured Notes | Debt Instrument, Redemption, Period Two | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum percentage of principal amount that can be redeemed | 40.00% |  |  |  |  |
7.00% Senior Notes, Due March 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate on debt (as a percent) | 7.00% |  |  |  |  |
Repayments of long-term debt | $ 1,600,000,000 |  |  |  |  |

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