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Share-based awards- Partner Capital Investment Plan (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
$ / shares
shares
Mar. 31, 2017
CNY (¥)
Dec. 31, 2016
$ / shares
shares
Mar. 31, 2016
CNY (¥)
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Share-based awards                
Share-based compensation expense ¥ 20,075   ¥ 15,995   ¥ 16,082      
Partner Capital Investment Plan | Subscription rights                
Share-based awards                
Agreed-upon exercise price | $ / shares   $ 26.00   $ 23.00   $ 14.50 $ 14.50 $ 14.50
Subscription period   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
Number of shares offered and subscribed | shares 17,300,000              
Unamortized compensation costs ¥ 1,062              
Weighted average period over which unamortized compensation costs expected be recognized 4 years 8 months 12 days              
Share-based compensation expense ¥ 435   ¥ 241   ¥ 0      
Subscription right fair value assumptions                
Risk-free interest rate 2.07%   1.86%          
Expected dividend yield 0.00%   0.00%          
Expected life (years) 8 years 3 months   8 years 3 months          
Expected volatility 34.20%   39.00%