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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Examination [Line Items]
Effective tax rate on income from operations	(37.00%)		(18.00%)	(124.00%)	(4.00%)
Effective tax rate excluding impact of equity adjustment	25.00%			25.00%
Effective tax rate excluding impact of impairment and restructuring charges			27.00%		27.00%
Effective income tax rate, estimated				25.00%
Deferred tax assets, valuation allowance	$ 219			$ 219		$ 220
Income from foreign sources				690
Income from domestic sources				581
Liabilities for uncertain tax positions	$ 95			$ 95		$ 96
UNITED KINGDOM
Income Tax Examination [Line Items]
Corporate tax rate	25.00%	19.00%

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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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in domestic income tax contingency.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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