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Intangible assets- General (Details)
$ in Millions
12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Mar. 31, 2016
CNY (¥)
Intangible assets          
Less: accumulated amortization and impairment     ¥ (3,543,000,000)   ¥ (6,809,000,000)
Net book value $ 833   6,575,000,000   5,370,000,000
Amortization of intangible assets $ 455 ¥ 2,931,000,000 2,089,000,000 ¥ 315,000,000  
Impairment charge   ¥ 0 0 ¥ 0  
Non-compete agreements          
Intangible assets          
Gross carrying amount     3,630,000,000   4,284,000,000
Developed technology and patents          
Intangible assets          
Gross carrying amount     3,331,000,000   3,652,000,000
Trade names, trademarks and domain names          
Intangible assets          
Gross carrying amount     2,007,000,000   2,222,000,000
User base and customer relationships          
Intangible assets          
Gross carrying amount     855,000,000   1,234,000,000
Licenses and copyrights and others          
Intangible assets          
Gross carrying amount     ¥ 295,000,000   ¥ 787,000,000