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FINANCING ARRANGEMENTS - Senior Unsecured Notes (Details) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Jan. 16, 2020 USD ($) | Dec. 30, 2019 USD ($) | Oct. 03, 2019 USD ($) | May 23, 2019 USD ($) | Mar. 08, 2019 USD ($) | Dec. 30, 2018 USD ($) | Jun. 01, 2018 USD ($) | Mar. 26, 2018 USD ($) | Dec. 18, 2017 USD ($) | Mar. 27, 2015 USD ($) | Apr. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2019 USD ($) | Mar. 27, 2015 EUR (€) | Jan. 30, 2015 USD ($) | Dec. 02, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage due to change in control (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 4,406,000,000 | $ 10,101,000,000 | $ 14,203,000,000 |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  | 42,000,000 | $ 119,000,000 | $ 122,000,000 |  |  |  |
Salix |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  | $ 10,340,000,000 |  |  |  |  |  |  |  |
5.50% Senior Unsecured Notes due March 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Senior Unsecured Notes due 2023 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased face amount | $ 1,240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
9.00% Senior Unsecured Notes due December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |
Settled Litigation | New Jersey | Valeant US Securities Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation, amount agreed to pay |  |  |  |  |  |  |  |  |  |  |  | $ 1,210,000,000 |  |  |  |  |  |
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 |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.625 % Senior Unsecured Notes due December 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.625% |  |  |  |  |  |  | 5.625% |  |  |  |  |  | 5.625%
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000
Repayments of long-term debt |  |  |  |  | $ 518,000,000 | $ 200,000,000 |  |  |  |  | $ 182,000,000 |  |  |  |  |  |  |
Senior Unsecured Notes | 5.50% Senior Unsecured Notes due March 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.50% |  |  |  |  |  |  | 5.50% |  |  |  |  | 5.50% |
Repayments of long-term debt |  |  |  | 382,000,000 | $ 216,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.375% Senior Notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.375% |  |  | 5.375% |  |  |  |  |  | 5.375% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 691,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.875% Senior Unsecured Notes due May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.875% |  |  |  |  | 5.875% |  | 5.875% |  |  |  | 5.875% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 1,118,000,000 | $ 584,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.875% Senior Unsecured Notes due May 2023 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 1,240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 4.50% Senior Unsecured Notes euro-denominated debt Due May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 4.50% |  | 4.50% |  |  |  | 4.50% |  |
Aggregate principal amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,500,000,000 |  |
Senior Unsecured Notes | 6.125% Senior Unsecured Notes due April 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 6.125% |  | 6.125% |  |  |  | 6.125% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 |  |  |  |  |  |  |  |
Redemption price percentage (as a percent) |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Senior Unsecured Notes | Senior Unsecured Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 9.00% Senior Unsecured Notes due December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 9.00% |  |  | 9.00% |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Repurchased face amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 9.25% Senior Unsecured Notes Due April 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 9.25% |  |  |  | 9.25% |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Repurchased face amount |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 8.50% Senior Unsecured Notes Due January 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 8.50% |  |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 7.00% Senior Unsecured Notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 7.25% Senior Unsecured Notes due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.00% Senior Unsecured Notes Due January 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.00% |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Aggregate principal amount |  | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 5.25% Senior Unsecured Notes Due January 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.25% |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |
Aggregate principal amount |  | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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