v3.20.4

Goodwill - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Cost |  |  | $ 10,098 | $ 10,063 | $ 8,971
Accumulated impairment |  |  | (114) | (114) | (114)
Book value | $ 9,949 | $ 8,857 | $ 9,984 | $ 9,949 | $ 8,857
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance, book value | 9,949 | 8,857 |  |  |
Changes in book value: |  |  |  |  |
Acquisitions | 3 | 1,138 |  |  |
Transfer to assets held for sale | 0 | (41) |  |  |
Translation differences | 32 | (5) |  |  |
Total changes | 35 | 1,092 |  |  |
Ending balance, book value | $ 9,984 | $ 9,949 |  |  |

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