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Goodwill and other intangible assets - Goodwill Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Beginning balance $ 14,689 $ 14,703
Addition from acquisitions 251 0
Currency translation adjustments (50) (14)
Ending balance $ 14,890 $ 14,689