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Share-based awards- Partner Capital Investment Plan (Details)
12 Months Ended
Mar. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
$ / shares
shares
Mar. 31, 2016
CNY (¥)
Dec. 31, 2015
$ / shares
shares
Mar. 31, 2015
CNY (¥)
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Share-based awards              
Share-based compensation expense ¥ 15,995,000,000   ¥ 16,082,000,000   ¥ 13,028,000,000    
Partner Capital Investment Plan | Subscription rights              
Share-based awards              
Agreed-upon exercise price | $ / shares   $ 23.00   $ 14.50   $ 14.50 $ 14.50
Subscription period   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
Number of shares offered and subscribed | shares 16,500,000            
Unamortized compensation costs ¥ 545,000,000            
Weighted average period over which unamortized compensation costs expected be recognized 4 years 10 months 24 days            
Share-based compensation expense ¥ 241,000,000   ¥ 0   ¥ 211,000,000    
Subscription right fair value assumptions              
Risk-free interest rate 1.86%       1.50%    
Expected dividend yield 0.00%       0.00%    
Expected life (years) 8 years 3 months       4 years    
Expected volatility 39.00%       38.10%    
Discount for post-vesting sale restrictions         35.00%