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Investment in equity investees (Details 2) - CNY (¥)
¥ in Millions
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Investment in equity investees        
Carrying value as equity method investment ¥ 18,204 ¥ 4,077 ¥ 196 ¥ 326
Equity method investments, publicly traded        
Investment in equity investees        
Carrying value as equity method investment 13,218      
Open market values of equity method investments 24,332      
Individually immaterial cost method investments, fair value estimated | Carrying amount        
Investment in equity investees        
Cost method investment 6,046 9,917    
Individually immaterial cost method investments, fair value estimated | Approximate fair value        
Investment in equity investees        
Cost method investment 14,965 14,455    
Individually immaterial cost method investments, not practical to estimate fair value | Carrying amounts        
Investment in equity investees        
Cost method investments carrying value for which there is no fair value estimate ¥ 9,627 ¥ 3,672