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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Interest limitation carry forwards | $ 22 | $ 157
R&D and state credit carry forwards | 42 | $ 40
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
NOL carry forwards | 1,609 |
Interest limitation carry forwards | 78 |
R&D and state credit carry forwards | 44 |
State |  |
Operating Loss Carryforwards [Line Items] |  |
NOL carry forwards | 1,488 |
Interest limitation carry forwards | 118 |
R&D and state credit carry forwards | 0 |
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
NOL carry forwards | 274 |
Interest limitation carry forwards | 14 |
R&D and state credit carry forwards | $ 0 |

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- Definition Deferred Tax Assets, Tax Credit Carryforwards, Interest Limitation + References No definition available. + Details
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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