Effective Income Tax Rate Reconciliation, Tax Credit Carrybacks, Foreign, Percent

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Percent

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Employee Service Share-Based Compensation, Tax Benefit From Exercise Of Stock Options And Vesting Of Restricted Stock Unit Awards

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Income Tax Benefit, Principally Related to Changes in Venezuela Foreign Currency Regime

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Tax Charge Resulting from Repatriation of Earnings of Foreign Subsidiaries

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)

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Venezuela Remeasurement Charges (Benefit), Tax Impact, Percent

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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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Amount of foreign earnings repatriated from subsidiaries outside the country of domicile.

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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Tax at United States statutory rate				21.00%	35.00%	35.00%
State income taxes, net of federal benefit				1.00%	0.50%	0.50%
Earnings taxed at other than United States statutory rate				4.50%	(3.40%)	(2.70%)
Charge for U.S. tax reform				2.30%	7.90%	0.00%
Excess tax benefits from stock-based compensation				(0.30%)	(1.40%)	0.00%
Foreign Tax Credit Carryback				(1.70%)	0.00%	0.00%
(Benefit) charge for previously disclosed tax matters				(0.40%)	0.00%	(0.80%)
(Benefit) on Venezuela remeasurement				0.00%	0.00%	(5.60%)
Tax charge on incremental repatriation of foreign earnings				0.00%	0.00%	5.60%
Other, net				(0.20%)	(0.90%)	(1.20%)
Effective tax rate				26.20%	37.70%	30.80%
Tax reform, provisional charge	$ 80	$ 275		$ 80	$ 275	$ 0
Tax benefit from exercise of stock options and vesting of restricted stock unit awards				$ 12	$ 47	59
CP Venezuela
Income Taxes [Line Items]
Income tax benefit, principally related to changes in Venezuela foreign currency regime			$ 210
Foreign earnings repatriated						$ 1,500
Tax charge resulting from repatriation of earnings of foreign subsidiaries			$ 210