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Taxes - Sumamry of Unrecognized Income Tax Benefits and Taxes Other Than on Income (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes to company's unrecognized tax benefits
Balance at January 1		$ 4,828	$ 3,031	$ 3,042
Foreign currency effects		(6)
Foreign currency effects			43	1
Additions based on tax positions taken in current year		239	1,853	245
Additions for tax positions taken in prior years		153	1,166	181
Reductions for tax positions taken in prior years		(131)	(90)	(390)
Settlements with taxing authorities in current year		(13)	(1,173)	(36)
Reductions as a result of a lapse of the applicable statute of limitations		0	(2)	(12)
Balance at December 31		5,070	4,828	3,031
Income Tax Authority [Line Items]
Excise and similar taxes on products and merchandise			7,189	6,905
Import duties and other levies	[1]	4,867	12,331	11,668
Total taxes other than on income		4,867	12,331	11,668
United States
Income Tax Authority [Line Items]
Excise and similar taxes on products and merchandise		4,830	4,398	4,335
Consumer excise taxes collected on behalf of third parties		(4,830)	0	0
Import duties and other levies		15	11	9
Property and other miscellaneous taxes		1,577	1,824	1,680
Payroll taxes		246	241	252
Taxes on production		325	206	159
Total taxes other than on income		2,163	6,680	6,435
International
Income Tax Authority [Line Items]
Excise and similar taxes on products and merchandise		3,031	2,791	2,570
Consumer excise taxes collected on behalf of third parties		(3,031)	0	0
Import duties and other levies		37	45	33
Property and other miscellaneous taxes		2,370	2,563	2,379
Payroll taxes		132	137	145
Taxes on production		165	115	106
Total taxes other than on income		$ 2,704	$ 5,651	$ 5,233
[1] 2017 and 2016 include excise, value-added and similar taxes of $7,189 and $6,905, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with Accounting Standards Update (ASU) 2014-09. Refer to Note 25, "Revenue" beginning on page 88.

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