Deferred tax assets tax credit carryforwards subject to expiration.

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Deferred taxes.

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Effective Income Tax Rate Reconciliation, Discrete Tax Expense (Benefit)

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Effective Income Tax Reconciliation, Nondeductible Goodwill Impairment Losses, Amount

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Income tax disclosure.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income tax provision (benefit)			$ (50,000,000)	$ (271,000,000)	$ 417,000,000
Negative impacts of non-deductible goodwill			585,000,000
Discrete tax benefit	$ 539,000,000	$ 539,000,000	539,000,000
Undistributed earnings in subsidiaries			5,000,000,000
Deferred income taxes			(285,000,000)	(474,000,000)	64,000,000
Deferred tax liability on total undistributed earnings			96,000,000
Deferred taxes			10,000,000
Deferred tax assets, valuation allowances			941,000,000	993,000,000
Gross tax loss carry forwards with indefinite lives			2,700,000,000
Unrecognized tax benefits, that would affect effective tax rate, if recognized			224,000,000
Income tax related interest and penalties recognized expense			1,000,000	6,000,000	13,000,000
Income tax related interest and penalties accrued			27,000,000	$ 25,000,000	$ 21,000,000
2021
Income Tax Disclosure [Line Items]
Gross tax loss carry forwards, subject to expiration			122,000,000
2022
Income Tax Disclosure [Line Items]
Gross tax loss carry forwards, subject to expiration			84,000,000
2023
Income Tax Disclosure [Line Items]
Gross tax loss carry forwards, subject to expiration			62,000,000
2024
Income Tax Disclosure [Line Items]
Gross tax loss carry forwards, subject to expiration			99,000,000
2025 and beyond
Income Tax Disclosure [Line Items]
Gross tax loss carry forwards, subject to expiration			440,000,000
Tax credit carryforward expiring year 2024
Income Tax Disclosure [Line Items]
Tax credit carry forwards, subject to expiration			1,000,000
Tax credit carryforward expiring year 2025 and beyond
Income Tax Disclosure [Line Items]
Tax credit carry forwards, subject to expiration			52,000,000
Subsidiaries Outside U.K.
Income Tax Disclosure [Line Items]
Deferred income taxes			$ 0
U.K
Income Tax Disclosure [Line Items]
Statutory federal income tax rate			19.00%	19.00%	19.00%