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Debt - Senior Secured Notes (Details) - USD ($) |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2019 | Nov. 14, 2018 | Nov. 01, 2018 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 15, 2019 | Oct. 10, 2018 | Jul. 02, 2018 | May 09, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 83,000,000 | $ 153,000,000 | $ 132,000,000 | $ 34,000,000 |  |  |  |
Interest expense on debt |  |  |  | 237,000,000 | $ 37,000,000 | 338,000,000 | 440,000,000 |  |  |  |
Total debt principal |  |  |  |  |  | 6,177,000,000 | 6,759,000,000 |  |  |  |
Cash collateral securing Senior Notes |  |  |  |  |  | 66,000,000 |  |  |  |  |
Restricted cash portion of cash collateral securing Senior Notes |  |  |  |  |  | 197,000,000 | 242,000,000 |  |  |  |
Accounts pledged as collateral for Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash portion of cash collateral securing Senior Notes |  |  |  |  |  | 30,000,000 | 24,000,000 |  |  |  |
Exploration and production equipment | West Rigel |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration received |  |  |  |  |  |  |  |  |  |  | $ 126,000,000
Secured Debt | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  | $ 880,000,000 |
Debt instrument, interest rate (as percent) |  |  |  |  |  |  |  |  |  | 12.00% |
Stated interest rate, cash portion (as a percent) |  |  |  |  | 4.00% |  |  |  |  | 4.00% |
Stated interest rate, paid-in-kind portion (as a percent) |  |  |  |  | 8.00% |  |  |  |  | 8.00% |
Compounded paid-in-kind interest |  |  |  |  |  | 39,000,000 |  | $ 18,000,000 |  | $ 10,000,000 |
Repayments of debt | $ 342,000,000 | $ 100,000 | $ 121,000,000 |  |  |  |  |  |  |  |
Interest expense on debt |  |  | $ 5,000,000 | $ 50,000,000 | $ 0 | 60,000,000 | 66,000,000 |  |  |  |
Tender offer, aggregate repurchase amount |  |  |  |  |  |  |  |  | $ 56,000,000 |  |
Repurchased principal amount | 311,000,000 |  |  |  |  |  |  |  |  |  |
Purchase premium and accrued interest included in debt repayment | $ 31,000,000 |  |  |  |  |  |  |  |  |  |
Premium percentage | 7.00% |  |  |  |  |  |  |  |  |  |
Total debt principal | $ 476,000,000 |  |  |  |  | $ 515,000,000 | $ 476,000,000 |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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