Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions		12 Months Ended
Dec. 07, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory tax rate		21.00%	35.00%	35.00%
Effect of foreign operations		(28.70%)	(12.20%)	(10.30%)
U.S. tax credits		(7.30%)	(4.00%)	(4.40%)
Impacts related to U.S. tax reform		8.20%	12.00%	0.00%
Tax law change related to foreign currency		0.00%	0.00%	2.40%
Stock-based compensation excess tax benefit		(1.50%)	(0.90%)	0.00%
Tax audit settlements		(2.50%)	(1.20%)	0.00%
All other, net		1.40%	2.60%	1.80%
Effective tax rate		(9.40%)	31.30%	24.50%
Net tax benefit related to the resolution of various tax positions pertaining to prior years		$ 131	$ 91
Expense related to tax effect of regulations of foreign operations foreign currency gains	$ 187

Effective income tax rate impacts related to U.S. tax reform

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Represents the portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to accrual of U.S. tax credits under enacted tax laws.

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Amount of (refund) expense recognized in income tax expense from examination settlement with taxing authority.

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

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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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 settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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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 repatriation of foreign earnings.

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