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Segment reporting (Details 2)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Share-based compensation ¥ (9,134)   ¥ (4,156) ¥ (3,695)
Total 4,141 $ 650 12,343 8,995
Unallocated items        
Share-based compensation (9,134)   (4,156) (3,695)
Amortization of intangible assets resulting from assets and business acquisitions (940)   (723) (885)
Effects of business cooperation arrangements 29   236 822
Total ¥ (10,045)   ¥ (4,643) ¥ (3,758)