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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($) |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 16, 2020 | Mar. 08, 2019 | Apr. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage to change in control (as a percent) |  |  |  | 101.00% |
Repayments of long-term debt |  |  |  | $ 3,062,000,000 | $ 3,503,000,000
Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage to change in control (as a percent) |  |  |  | 101.00% |
Repayments of long-term debt |  |  |  | $ 26,000,000 |
5.75% Senior Notes Due August 2027 | Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt (as a percent) |  | 5.75% |  |  |
Principal amount |  | $ 500,000,000 |  |  |
8.50% Senior Notes Due January 2027 | Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt (as a percent) |  | 8.50% |  | 8.50% |
Principal amount |  | $ 1,000,000,000 |  |  |
5.875% Senior Notes Due May 2023 | Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt (as a percent) |  | 5.875% |  | 5.875% |
Repayments of long-term debt | $ 1,240,000,000 | $ 584,000,000 |  |  |
5.625% Senior Notes Due December 2021 | Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt (as a percent) |  | 5.625% |  |  |
Repayments of long-term debt |  | $ 518,000,000 | $ 182,000,000 |  |
5.50% Senior Notes Due March 2023 | Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt (as a percent) |  | 5.50% |  | 5.50% |
Repayments of long-term debt |  | $ 216,000,000 |  |  |
Senior Secured Notes and Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 1,500,000,000 |  |

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