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Income Taxes - Expiration Periods for Deferred Tax Assets (Details) $ in Millions	Dec. 31, 2020 USD ($)
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 3,800
Foreign Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	83
Tax credit carryforwards	17
Indefinite Tax Period | Domestic Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	2,600
Expires from 2021 - 2037 | Domestic Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	3,400
General Business Tax Credit Carryforward
Income Tax Examination [Line Items]
Tax credit carryforwards	$ 240

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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