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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, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | $ 32,647 | $ 39,431
Fixed assets, net | 8,475 | 8,260
Operating Segments [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 32,647 | 39,431
Fixed assets, net | 8,475 | 8,260
Operating Segments [Member] | North America [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 15,713 | 19,349
Fixed assets, net | 3,831 | 3,941
Operating Segments [Member] | North America [Member] | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 8,210 | 9,702
Fixed assets, net | 1,610 | 1,661
Operating Segments [Member] | North America [Member] | Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 4,144 | 5,353
Fixed assets, net | 974 | 993
Operating Segments [Member] | North America [Member] | Mexico |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 3,359 | 4,294
Fixed assets, net | 1,247 | 1,287
Operating Segments [Member] | Europe [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 14,472 | 17,331
Fixed assets, net | 3,733 | 3,608
Operating Segments [Member] | Europe [Member] | Austria |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 6,817 | 8,279
Fixed assets, net | 867 | 872
Operating Segments [Member] | Europe [Member] | Germany |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 4,366 | 4,878
Fixed assets, net | 1,095 | 1,090
Operating Segments [Member] | Europe [Member] | Czech Republic |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 912 | 899
Fixed assets, net | 293 | 276
Operating Segments [Member] | Europe [Member] | Poland |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 535 | 689
Fixed assets, net | 221 | 201
Operating Segments [Member] | Europe [Member] | Russia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 345 | 434
Fixed assets, net | 120 | 134
Operating Segments [Member] | Europe [Member] | Spain |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 323 | 431
Fixed assets, net | 82 | 79
Operating Segments [Member] | Europe [Member] | United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 292 | 422
Fixed assets, net | 214 | 209
Operating Segments [Member] | Europe [Member] | Italy |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 256 | 527
Fixed assets, net | 265 | 244
Operating Segments [Member] | Europe [Member] | Turkey |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 247 | 293
Fixed assets, net | 9 | 10
Operating Segments [Member] | Europe [Member] | France |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 142 | 201
Fixed assets, net | 62 | 55
Operating Segments [Member] | Europe [Member] | Slovakia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 126 | 139
Fixed assets, net | 283 | 223
Operating Segments [Member] | Europe [Member] | Other Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 111 | 139
Fixed assets, net | 222 | 215
Operating Segments [Member] | Asia Pacific [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 2,031 | 2,164
Fixed assets, net | 853 | 631
Operating Segments [Member] | Asia Pacific [Member] | China |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 1,921 | 1,947
Fixed assets, net | 758 | 528
Operating Segments [Member] | Asia Pacific [Member] | India |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 79 | 144
Fixed assets, net | 89 | 98
Operating Segments [Member] | Asia Pacific [Member] | Other Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 31 | 73
Fixed assets, net | 6 | 5
Operating Segments [Member] | Rest Of The World [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Sales | 431 | 587
Fixed assets, net | $ 58 | $ 80

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