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Significant equity transactions, mergers and acquisitions and investments - Local Services Holdco (Details) - Local Services Holdco ¥ in Millions, $ in Millions	1 Months Ended
	Jan. 31, 2021 USD ($)	May 31, 2020 USD ($)	May 31, 2020 CNY (¥)
Equity transactions, mergers and acquisitions and investments
Cash consideration for additional equity interest acquired	$ 1,500	$ 450	¥ 3,197
Increase in noncontrolling interests			¥ 467
Equity interest held (as a percentage)	73.00%	73.00%	73.00%

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Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

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Amount of increase in noncontrolling interest from a business combination.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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