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Long-Term Debt - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Aug. 31, 2020 | Aug. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Long-term Debt |  |  |  |  |  |
Note payable retired |  |  |  | $ 260 | $ 0 |
Total Fair Value |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Estimated fair value of debt |  |  |  | 31,500 |  | $ 38,800
Total Fair Value | Level 2 |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Estimated fair value of debt |  |  |  | $ 1,600 |  |
Variable rate bonds due February 2021 | Subsequent Event |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Maturity of notes | 2 years |  |  |  |  |
Debt redeemed | $ 377 |  |  |  |  |
2-year variable rate Term Loan due 2021 | Subsequent Event |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Debt redeemed | 1,000 |  |  |  |  |
Outstanding term loan | $ 446 |  |  |  |  |
Low end of range | Issuance Of July And August 2020 Notes |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Maturity of notes |  |  | 5 years |  |  |
Low end of range | Tender Offers July And August 2020 |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Maturity of notes |  |  | 1 year |  |  |
High end of range | Issuance Of July And August 2020 Notes |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Maturity of notes |  |  | 10 years |  |  |
High end of range | Tender Offers July And August 2020 |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Maturity of notes |  |  | 3 years |  |  |
WES |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Common units exchanged to retire note payable |  | 27.9 |  |  |  |
Note payable retired |  | $ 260 |  |  |  |
Loss on exchange |  | 46 |  |  |  |
Gain on debt extinguished |  | $ 76 |  |  |  |

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