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Bank borrowings- General (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Apr. 30, 2017
USD ($)
Mar. 31, 2022
CNY (¥)
item
Mar. 31, 2021
CNY (¥)
item
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Bank borrowings            
Current bank borrowings     ¥ 8,841 ¥ 3,606 $ 1,395  
Non-current bank borrowings     38,244 38,335 6,033  
Bank borrowings            
Bank borrowings            
Current bank borrowings     8,841      
Non-current bank borrowings     38,244 38,335    
Collateral amount pledged     19,617 18,365    
Short-term other borrowings | Bank loans            
Bank borrowings            
Current bank borrowings     8,841 3,606    
US$4.0 billion syndicated loan denominated in US$ | Bank loans            
Bank borrowings            
Non-current bank borrowings     ¥ 25,331 ¥ 26,153    
Principal amount | $         $ 4,000 $ 4,000
Number of lead arrangers | item     8 8    
US$4.0 billion syndicated loan denominated in US$ | Bank loans | LIBOR            
Bank borrowings            
Spread over variable rate     0.85% 0.85%    
Long-term other borrowings | Bank loans            
Bank borrowings            
Non-current bank borrowings     ¥ 12,913 ¥ 12,182    
Long-term borrowings | Bank loans            
Bank borrowings            
Weighted average interest rate for the year     4.10% 4.30%    
Short-term borrowings | Bank loans            
Bank borrowings            
Weighted average interest rate for the year     2.80% 2.90%    
Short-term borrowings | Bank loans | Minimum            
Bank borrowings            
Interest rates     0.60% 0.60% 0.60% 0.60%
Short-term borrowings | Bank loans | Maximum            
Bank borrowings            
Interest rates     12.50% 12.50% 12.50% 12.50%
US$5.15 billion revolving credit facility agreement | Bank facility            
Bank borrowings            
Amount of loan facility | $   $ 5,150        
US$5.15 billion revolving credit facility agreement | Bank facility | LIBOR            
Bank borrowings            
Spread over variable rate   0.95%        
USD6.5 billion revolving credit facility agreement | Bank facility            
Bank borrowings            
Amount of loan facility | $ $ 6,500          
USD6.5 billion revolving credit facility agreement | Bank facility | LIBOR            
Bank borrowings            
Spread over variable rate 0.80%