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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Other	$ 835		$ 835
Deferred Tax Assets, Tax Credit Carryforwards	4		6
Income Tax Examination, Penalties and Interest Expense	0	$ 0	0	$ 0
Income Tax Examination, Interest Accrued	0	$ 0	0	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0		0
Income Tax Examination, Penalties Accrued	$ 0		0
UNITED STATES
Operating Loss Carryforwards [Line Items]
Deferred Other Tax Expense (Benefit)			352
UNITED KINGDOM
Operating Loss Carryforwards [Line Items]
Deferred Other Tax Expense (Benefit)			$ 2

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- Definition

Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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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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