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Commitments and contingencies (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | $ 3,296
Not later than one year |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | 549
Later than one year and not later than two years [member] |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | 248
Later than two years and not later than three years [member] |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | 160
Later than three years and not later than four years [member] |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | 415
Later than four years and not later than five years [member] |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | 515
Later than five years |
Schedule for commitments under fixed term operating leases [line items] |
Research and development commitments for transactions entered into current year, closed after current year end | $ 1,409

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