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Share-based awards- Partner Capital Investment Plan (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2019
CNY (¥)
Dec. 31, 2018
$ / shares
shares
Mar. 31, 2018
CNY (¥)
Dec. 31, 2017
$ / shares
shares
Mar. 31, 2017
CNY (¥)
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Mar. 31, 2019
$ / shares
Mar. 31, 2019
CNY (¥)
shares
Share-based awards                      
Share-based compensation expense | ¥ ¥ 37,491   ¥ 20,075   ¥ 15,995            
Partner Capital Investment Plan | Subscription rights                      
Share-based awards                      
Agreed-upon exercise price | $ / shares             $ 14.50 $ 14.50 $ 14.50    
Subscription period 10 years 10 years   10 years   10 years 4 years 4 years 4 years    
Restriction period for the transfer shares             8 years 8 years 8 years    
Number of shares underlying | shares   18,000,000   18,000,000   18,000,000 18,000,000 18,000,000 18,000,000   18,000,000
Number of shares offered and subscribed | shares                     17,500,000
Unamortized compensation costs | ¥                     ¥ 941
Weighted average period over which unamortized compensation costs expected be recognized 4 years 6 months                    
Share-based compensation expense | ¥ ¥ 409   ¥ 435   ¥ 241            
Subscription right fair value assumptions                      
Risk-free interest rate 2.94%   2.07%   1.86%            
Expected dividend yield 0.00%   0.00%   0.00%            
Expected life (years) 8 years 3 months   8 years 3 months   8 years 3 months            
Expected volatility 33.00%   34.20%   39.00%            
Partner Capital Investment Plan | Subscription rights | Minimum                      
Share-based awards                      
Agreed-upon exercise price | $ / shares   $ 23.00   $ 23.00   $ 23.00       $ 23.00  
Partner Capital Investment Plan | Subscription rights | Maximum                      
Share-based awards                      
Agreed-upon exercise price | $ / shares   $ 26.00   $ 26.00   $ 26.00       $ 26.00