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Taxes - Summary of Unrecognized Income Tax Benefits and Taxes Other Than on Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes to company's unrecognized tax benefits      
Balance at January 1 $ 4,987 $ 5,070 $ 4,828
Foreign currency effects 2 1  
Foreign currency effects     (6)
Additions based on tax positions taken in current year 253 94 239
Additions for tax positions taken in prior years 437 313 153
Reductions for tax positions taken in prior years (216) (194) (131)
Settlements with taxing authorities in current year (429) (78) (13)
Reductions as a result of a lapse of the applicable statute of limitations (16) (219) 0
Balance at December 31 5,018 4,987 5,070
Income Tax Authority [Line Items]      
Import duties and other levies 4,499 4,136 4,867
Total taxes other than on income 4,499 4,136 4,867
United States      
Income Tax Authority [Line Items]      
Excise and similar taxes on products and merchandise 4,566 4,990 4,830
Consumer excise taxes collected on behalf of third parties (4,566) (4,990) (4,830)
Import duties and other levies 7 2 15
Property and other miscellaneous taxes 2,248 1,785 1,577
Payroll taxes 235 254 246
Taxes on production 317 355 325
Total taxes other than on income 2,807 2,396 2,163
International      
Income Tax Authority [Line Items]      
Excise and similar taxes on products and merchandise 2,367 2,801 3,031
Consumer excise taxes collected on behalf of third parties (2,367) (2,801) (3,031)
Import duties and other levies 39 35 37
Property and other miscellaneous taxes 1,461 1,435 2,370
Payroll taxes 117 125 132
Taxes on production 75 145 165
Total taxes other than on income $ 1,692 $ 1,740 $ 2,704