v3.20.4

Identified Intangible Assets - Summary of Changes in Identified Intangible Assets (Details) - 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 |  |  | $ 9,249 | $ 9,384 | $ 9,183
Accumulated amortization/impairment | $ (5,764) | $ (4,716) |  |  |
Book value | 3,620 | 3,620 | $ 2,242 | $ 3,620 | $ 4,467
Indefinite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Beginning balance, Book value | 3,620 | 4,467 |  |  |
Changes in book value: |  |  |  |  |
Acquisitions/additions | 63 | 683 |  |  |
Transfer to assets held for sale | 0 | (1) |  |  |
Amortization | (1,398) | (1,529) |  |  |
Impairment | (43) |  |  |  |
Translation differences | 0 |  |  |  |
Total changes | (1,378) | (847) |  |  |
Ending balance, Book value | $ 2,242 | $ 3,620 |  |  |

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