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Fresh Start Accounting - Reconciliation of Distributable Value to Fair Value of Successor Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 02, 2018 | Jul. 01, 2018 | Apr. 17, 2018
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Restructuring and Related Activities [Abstract] |  |  |  |  |  |
Distributable value |  |  |  | $ 11,056 |  | $ 11,000
Less: non-controlling interest |  |  |  | (154) | $ (154) |
Less: fair value of debt |  |  |  | (7,301) |  |
Less: fair value of other non-operating liabilities |  |  |  | (108) |  |
Add: fair value of tax attributes |  |  |  | 8 |  |
Fair value of Successor common stock issued upon emergence |  |  |  | $ 3,501 |  |
Common stock, shares issued (in shares) | 100,384,435 | 100,234,973 | 100,000,000 | 100,000,000 |  |
Per share value (in dollars per share) |  |  |  | $ 35.01 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of reorganization value related to present value of discounted cash flows of the emerging entity. Reorganization value is the amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56239-112766 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 05 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49179835&loc=d3e54813-112758 + Details
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