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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill |  |  |
Balance at January 1 | $ 20,848,000,000 | $ 20,725,000,000 |
Currency | 516,000,000 | 17,000,000 |
Divestitures | 0 | (43,000,000) |
Acquisitions | 531,000,000 | 149,000,000 |
Asset impairments | 0 | 0 | $ 0
Balance at December 31 | 21,895,000,000 | 20,848,000,000 | 20,725,000,000
Intangible Assets, at cost |  |  |
Balance at January 1 | 19,670,000,000 | 19,529,000,000 |
Currency | 320,000,000 | 60,000,000 |
Divestitures | 0 | 0 |
Acquisitions | 553,000,000 | 138,000,000 |
Asset impairments | (144,000,000) | (57,000,000) |
Balance at December 31 | $ 20,399,000,000 | $ 19,670,000,000 | $ 19,529,000,000

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