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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities 2017 Activity (Details) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2019 | Mar. 21, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 01, 2018 | Mar. 28, 2017 | Jan. 01, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
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 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 571,000,000 |  |  |  |
Repayments of lines of credit |  | $ 350,000,000 | $ 806,000,000 |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,190,000,000 | $ 1,500,000,000
Senior Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt, using sale proceeds |  |  |  |  | 3,221,000,000 |  |  |
Repayments of long-term debt, using cash on hand |  |  |  |  | 786,000,000 |  |  |
Loss on extinguishment of debt |  |  |  |  | 66,000,000 |  |  |
2023 Revolving Credit Facility Due June 2023 | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  | 4,962,000,000 |  |  |  |  |  |
Stated interest rate |  |  | 4.74% |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,225,000,000 |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased face amount |  | $ 1,100,000,000 |  |  |  |  |  |
Stated interest rate |  | 6.75% |  |  |  |  |  |
Revolving Credit Facility Due April 2020 | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 3,000,000 |  |  |

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