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Deferred Revenue (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred Revenue    
Amount of revenues recognized included in the deferred revenue ¥ 8,149.2 ¥ 7,319.4
Transaction price allocated to unsatisfied performance obligations ¥ 10,945.1  
Explanation of expected timing of satisfaction remaining performance obligation The Group expects to recognize a significant majority of this balance as revenue over the next 12 months, and the remainder thereafter.