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v3.20.2

General (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2019 | Aug. 31, 2020 | Apr. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Anadarko acquisition-related costs |  |  |  | $ (5) |  |  | $ (924) | $ (302) | $ (974) |  |  |
Impairment and related charges |  |  |  |  | $ 8,600 |  |  |  |  |  |  |
Income taxes paid |  |  |  |  |  |  |  | 375 | 827 |  |  |
Domestic tax refunds |  |  |  | 223 |  |  |  |  | 5 |  |  |
Interest paid |  |  |  | 1,300 |  |  |  |  | 611 |  |  |
Cash and cash equivalents |  |  |  | 1,896 |  |  | 4,840 | 1,896 | 4,840 |  | $ 3,032 |
Restricted cash and restricted cash equivalents |  |  |  | 51 |  |  | 467 | 51 | 467 |  | 485 |
Cash and restricted cash included in assets held for sale |  |  |  | 113 |  |  | 3 | 113 | 3 |  |  |
Restricted cash and restricted cash equivalents included in long-term receivables and other assets, net |  |  |  | 14 |  |  | 55 | 14 | 55 |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  |  |  | 2,074 |  |  | 5,365 | 2,074 | 5,365 |  | 3,574 | $ 3,033
Equity method investment amounts |  |  |  | 3,125 |  |  |  | 3,125 |  |  | 6,389 |
Loss from equity investment |  |  |  | (123) |  |  | $ (104) | (183) | (274) |  |  |
Note payable retired |  |  |  |  |  |  |  | 260 | $ 0 |  |  |
WES |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on non-cash transaction |  |  |  |  |  |  |  | 46 |  |  |  |
Common units exchanged to retire note payable |  | 27.9 |  |  |  |  |  |  |  |  |  |
Note payable retired |  | $ 260 |  |  |  |  |  |  |  |  |  |
Sales |  |  |  | 46 |  |  |  | 165 |  |  |  |
WES | Purchases |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  | 164 |  |  |  | 474 |  |  |  |
WES | Transportation, gathering and other fees paid |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  | 258 |  |  |  | $ 804 |  |  |  |
WES Midstream segment |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-voting general partner interest |  |  |  |  |  |  |  | 2.00% |  |  |  |
Limited partner interest |  |  |  |  |  |  |  | 51.50% |  |  |  |
Effective economic interest |  |  |  |  |  |  |  | 53.50% |  |  |  |
Ownership interest, intended reduction |  |  |  |  |  |  |  | 50.00% |  |  |  |
Pro-rata interest in net assets |  |  |  | 370 |  |  |  | $ 370 |  |  |  |
Public Ownership | WES Midstream segment | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partner interest | 44.60% |  |  |  |  |  |  |  |  |  |  |
WES Midstream segment |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  |  |  | 1,900 |  |  |  | 1,900 |  |  | $ 5,100 |
Loss from equity investment |  |  |  |  |  | $ 440 |  |  |  |  |  |
Impairment of equity method investment |  |  |  | 2,700 |  |  |  |  |  |  |  |
Algeria Africa Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  | $ 931 |  |  |  |  |  |  |  |  |
Ghana Assets |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  | $ 1,400 |  |  |  | 1,400 |  |  |  |
Ghana Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | $ 1,400 |  |  |  |  |  |  |
Anadarko |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Anadarko acquisition-related costs |  |  |  |  |  |  |  | (302) |  |  |  |
Domestic tax refunds |  |  |  |  |  |  |  | $ 881 |  | $ 881 |  |

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