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Unsecured senior notes- Maturity schedule (Details)
¥ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Level 2        
Unsecured senior notes        
Fair value $ 13,679 ¥ 91,964 $ 13,317 ¥ 83,590
Unsecured senior notes        
Future principal payments        
Within 1 year   15,127    
Between 2 to 3 years   10,084    
Between 4 to 5 years   4,706    
Thereafter   62,189    
Total principal amount   ¥ 92,106   ¥ 85,996