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Goodwill and other intangible assets - Narrative (Details) - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization charges associated with finite-lived intangible assets $ 2.8 $ 1.4 $ 1.3
Total estimated amortization of finite-lived intangible assets for 2021 2.6    
Total estimated amortization of finite-lived intangible assets for 2022 2.5    
Total estimated amortization of finite-lived intangible assets for 2023 2.4    
Total estimated amortization of finite-lived intangible assets for 2024 2.4    
Total estimated amortization of finite-lived intangible assets for 2025 $ 2.2