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Debt - Schedule of Debt and Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 10, 2019 | Jul. 02, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt principal | $ 6,177 | $ 6,759 |  |
Less: debt discount and fees | 0 | (136) |  |
Carrying value | 6,177 | 6,623 |  |
Debt due within one year | 6,177 | 343 |  |
Long-term debt | 0 | 6,280 |  |
Senior credit facilities | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt principal | 5,662 | 5,662 |  |
Senior Secured Notes | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt principal | 515 | 476 | $ 476 |
Carrying value |  |  |  | $ 866
Credit facilities contained within variable interest entities | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt principal | $ 0 | $ 621 |  |

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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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