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Commitments- Operating lease commitments (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Operating lease commitments for office facility and transportation equipment      
No later than 1 year ¥ 4,984 ¥ 2,760  
Later than 1 year and no later than 5 years 10,675 7,652  
More than 5 years 15,346 11,940  
Total 31,005 22,352  
Rental expenses under operating leases ¥ 4,699 ¥ 2,279 ¥ 747