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Goodwill and intangible assets - Estimated Annual Amortization Expense (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 $ 104
2021 81
2022 63
2023 52
2024 $ 45