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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
CNY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
CNY (¥)
Intangible assets        
Gross carrying amount     ¥ 103,126 ¥ 50,398
Less: accumulated amortization and impairment     (34,850) (22,933)
Net book value   $ 10,173 68,276 27,465
User base and customer relationships        
Intangible assets        
Gross carrying amount     47,913 13,510
Trade names, trademarks and domain names        
Intangible assets        
Gross carrying amount     22,592 14,198
Non-compete agreements        
Intangible assets        
Gross carrying amount     12,528 7,820
Non-compete agreements | Youku        
Intangible assets        
Intangible assets acquired ¥ 2,528      
Remaining amortization period   1 year    
Developed technology and patents        
Intangible assets        
Gross carrying amount     9,510 5,463
Licensed copyrights        
Intangible assets        
Gross carrying amount     9,225 9,182
Others        
Intangible assets        
Gross carrying amount     ¥ 1,358 ¥ 225