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Contingencies and commitments - Summary of aggregate amount of future payment commitments under purchase obligations outstanding (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Minimum lease payments payable under non-cancellable operating lease |  | $ 1,717
Aggregate amount of future payment commitments under purchase obligations outstanding | $ 16,919 | 17,050
Within 1 year [member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Minimum lease payments payable under non-cancellable operating lease |  | 475
Aggregate amount of future payment commitments under purchase obligations outstanding | 2,920 | 2,804
Between 1 and 3 years [member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Minimum lease payments payable under non-cancellable operating lease |  | 587
Between 3 and 5 years [member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Minimum lease payments payable under non-cancellable operating lease |  | 270
More than 5 years [member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Minimum lease payments payable under non-cancellable operating lease |  | 385
Aggregate amount of future payment commitments under purchase obligations outstanding | 8,697 | 9,358
Between 1 and 2 years [Member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 1,705 | 1,565
Between 2 and 3 years [Member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 1,431 | 1,344
Between 3 and 4 years [Member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 1,084 | 1,097
Between 4 and 5 years [Member] |  |
Disclosure of future payment commitments under purchase obligations [Line Items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | $ 1,082 | $ 882

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