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DERIVATIVES - ADDITIONAL INFORMATION (Details) - USD ($) | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 27, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Aug. 08, 2019
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives | [1] |  |  | $ (129,000,000) | $ (6,000,000) | $ 13,000,000 |  |  |  |
Not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed (net of collateral) |  |  | $ 787,000,000 | 787,000,000 | 68,000,000 |  |  |  |  |
Amount of collateral posted related to derivative instruments with credit-risk-related contingent features |  |  | 169,000,000 | 169,000,000 | $ 1,000,000 |  |  |  |  |
Anadarko Petroleum Corporation |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  | $ 21,800,000,000
Anadarko Petroleum Corporation | Senior notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  | $ 13,000,000,000.0
Anadarko Petroleum Corporation | Common Stock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrant (usd per share) |  |  |  |  |  |  |  |  |  | $ 62.50
Interest Rate Swap, 6.835% |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional Principal Amount |  |  | 125,000,000 | 125,000,000 |  |  |  |  | $ 125,000,000 |
Interest Rate Swap, 6.835% | Subsequent Event |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional Principal Amount |  |  |  |  |  |  | $ 150,000,000 |  |  |
Interest Rate Swap, 6.570% |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional Principal Amount |  |  | 250,000,000 | $ 250,000,000 |  |  |  |  |  |
Interest Rate Swap, 6.570% | Subsequent Event |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional Principal Amount |  |  |  |  |  |  |  | $ 500,000,000 |  |
Warrant |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Initial fair value of warrant |  |  |  |  |  |  |  |  |  | $ 188,000,000
Interest Rate Contract |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash receipts related to settlements |  |  | $ 120,000,000 |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives |  | $ (125,000,000) |  |  |  |  |  |  |  |
Interest Rate Contract | Senior notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  | $ 13,000,000,000.0 |  |  |  |  |  |  |  |
[1] | Net of tax of $36, $2 and $(7) in 2019, 2018 and 2017, respectively.

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