Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory tax rate	21.00%	21.00%	35.00%
Effect of foreign operations	(8.40%)	(28.70%)	(12.20%)
U.S. tax credits	(3.30%)	(7.30%)	(4.00%)
Impacts related to U.S. tax reform	(1.60%)	8.20%	12.00%
Stock-based compensation excess tax benefit	(0.20%)	(1.50%)	(0.90%)
Tax audit settlements	(4.70%)	(2.50%)	(1.20%)
Deferred tax remeasurements due to change in tax rate	3.10%	0.00%	0.00%
All other, net	0.60%	1.40%	2.60%
Effective tax rate	6.50%	(9.40%)	31.30%
Net tax benefit related to the resolution of various tax positions pertaining to prior years	$ 400	$ 131	$ 91

Effective Income Tax Rate Reconciliation Deferred Tax Remeasurements Due To Change in Tax Rate

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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 expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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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