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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 26, 2020 | Jan. 16, 2020 | May 23, 2019 | Mar. 08, 2019 | Jun. 01, 2018 | Apr. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Nov. 21, 2017 | Oct. 17, 2017 | Mar. 31, 2017 | Mar. 27, 2015 | Dec. 02, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage due to change in control (as a percent) |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  | $ 5,642,000,000 | $ 4,406,000,000 | $ 10,101,000,000 |  |  |  |  |  |
Loss on extinguishment of debt | $ 27,000,000 |  |  | $ 8,000,000 |  |  |  | $ 59,000,000 | $ 42,000,000 | $ 119,000,000 |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage due to change in control (as a percent) |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
6.50% Senior Notes Due March 2022 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  | 6.50% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |  |
7.00 % Senior Notes Due March 2024 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  | 7.00% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
5.50% Senior Notes Due November 2025 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.50% |  |  |  |  | 5.50% |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 | $ 1,000,000,000 |  |  |
5.75% Senior Notes Due August 2027 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.75% |  |  |  | 5.75% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
8.50% Senior Unsecured Notes Due January 2027 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 750,000,000 |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Redemption price percentage (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
5.875% Senior Unsecured Notes due May 2023 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.875% |  |  |  |  |  |  |  |  |  |  | 5.875% |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 |
Repayments of long-term debt |  | $ 1,240,000,000 | $ 1,118,000,000 | $ 584,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.625 % Senior Unsecured Notes due December 2021 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.625% |  |  |  |  |  |  |  |  |  |  |  | 5.625%
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000
Repayments of long-term debt |  |  |  | $ 518,000,000 |  | $ 182,000,000 | $ 200,000,000 |  |  |  |  |  |  |  |  |
Senior Secured and Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |

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