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Segmented Information - Schedule of External Revenues and Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | $ 39,431 | $ 40,827
Fixed assets, net | 8,260 | 8,095
Operating Segments [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 39,431 | 40,827
Fixed assets, net | 8,260 | 8,095
Operating Segments [Member] | North America [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 19,349 | 20,547
Fixed assets, net | 3,941 | 3,635
Operating Segments [Member] | North America [Member] | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 9,702 | 10,043
Fixed assets, net | 1,661 | 1,359
Operating Segments [Member] | North America [Member] | Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 5,353 | 5,886
Fixed assets, net | 993 | 1,001
Operating Segments [Member] | North America [Member] | Mexico |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 4,294 | 4,618
Fixed assets, net | 1,287 | 1,275
Operating Segments [Member] | Europe [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 17,331 | 17,055
Fixed assets, net | 3,608 | 3,676
Operating Segments [Member] | Europe [Member] | Austria |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 8,279 | 7,750
Fixed assets, net | 872 | 938
Operating Segments [Member] | Europe [Member] | Germany |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 4,878 | 4,893
Fixed assets, net | 1,090 | 1,271
Operating Segments [Member] | Europe [Member] | Czech Republic |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 899 | 764
Fixed assets, net | 276 | 257
Operating Segments [Member] | Europe [Member] | Poland |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 689 | 694
Fixed assets, net | 201 | 200
Operating Segments [Member] | Europe [Member] | Italy |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 527 | 850
Fixed assets, net | 244 | 288
Operating Segments [Member] | Europe [Member] | United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 422 | 517
Fixed assets, net | 209 | 191
Operating Segments [Member] | Europe [Member] | Russia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 434 | 424
Fixed assets, net | 134 | 138
Operating Segments [Member] | Europe [Member] | Spain |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 431 | 382
Fixed assets, net | 79 | 47
Operating Segments [Member] | Europe [Member] | Turkey |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 293 | 291
Fixed assets, net | 10 | 8
Operating Segments [Member] | Europe [Member] | France |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 201 | 219
Fixed assets, net | 55 | 46
Operating Segments [Member] | Europe [Member] | Slovakia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 139 | 127
Fixed assets, net | 223 | 71
Operating Segments [Member] | Europe [Member] | Other Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 139 | 144
Fixed assets, net | 215 | 221
Operating Segments [Member] | Asia Pacific [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 2,164 | 2,540
Fixed assets, net | 631 | 718
Operating Segments [Member] | Asia Pacific [Member] | China |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 1,947 | 2,152
Fixed assets, net | 528 | 588
Operating Segments [Member] | Asia Pacific [Member] | India |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 144 | 180
Fixed assets, net | 98 | 106
Operating Segments [Member] | Asia Pacific [Member] | Korea |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 44 | 158
Fixed assets, net | 1 | 21
Operating Segments [Member] | Asia Pacific [Member] | Other Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 29 | 50
Fixed assets, net | 4 | 3
Operating Segments [Member] | Rest Of The World [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 587 | 685
Fixed assets, net | $ 80 | $ 66

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