Income Taxes - Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effects of US Tax Reform	0.00%	0.00%	(2.40%)
Income Tax Expense (Benefit), Intraperiod Tax Allocation	0.00%	(2.00%)	0.00%
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal income tax rate (benefit)	(21.00%)	(21.00%)	(35.00%)
State and local income taxes, net of federal income tax benefit	(0.20%)	0.30%	(0.40%)
Tax credits	0.00%	0.00%	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent	40.20%	(4.70%)	(2.10%)
Foreign taxes at other than the federal statutory rate (including tax holidays)	5.10%	12.90%	(1.30%)
Federal and foreign valuation allowance	(20.40%)	35.60%	46.20%
Withholding taxes	0.10%	0.20%	0.10%
Unremitted earnings	0.10%	0.00%	(1.10%)
Dividends	0.00%	0.00%	5.70%
Effective Income Tax Rate Reconciliation, Debt Repurchase, Percent	1.70%	0.00%	0.00%
Foreign branch activity	12.40%	0.10%	(1.20%)
Uncertain tax positions	1.40%	(1.90%)	0.10%
Other, net	1.70%	0.10%	(2.90%)
Effective Income Tax Rate, Continuing Operations	21.10%	28.80%	15.50%

Effective Income Rate Reconciliation Nondeductible Expense Unremitted Earnings

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Effective Income Tax Rate Reconciliation, Debt Repurchase, Percent

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Effective Income Tax Rate Reconciliation, Withholding Taxes

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Effects of US Tax Reform

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Intraperiod allocations to OCI

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

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

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage 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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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