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Significant restructuring transaction, mergers and acquisitions and investments- Lazada (Details)
¥ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 30, 2016
CNY (¥)
country
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2017
CNY (¥)
The allocation of the purchase price at the date of acquisition                  
Goodwill       $ 39,477     ¥ 162,149 ¥ 264,935 ¥ 125,420
Lazada                  
The allocation of the purchase price at the date of acquisition                  
Equity interest held in subsidiary (as a percentage)       92.00%       92.00%  
User base and customer relationships | Maximum                  
The allocation of the purchase price at the date of acquisition                  
Estimated amortization periods       16 years 16 years        
Non-compete agreements | Maximum                  
The allocation of the purchase price at the date of acquisition                  
Estimated amortization periods       6 years 6 years        
Trade names, trademarks and domain names | Maximum                  
The allocation of the purchase price at the date of acquisition                  
Estimated amortization periods       20 years 20 years        
Developed technology and patents | Maximum                  
The allocation of the purchase price at the date of acquisition                  
Estimated amortization periods       5 years 5 years        
Lazada                  
The allocation of the purchase price at the date of acquisition                  
Number of countries in which the entity operates | country   6              
Lazada                  
Acquisition                  
Percentage of equity interest acquired   54.00%              
Cash consideration for additional equity interest acquired $ 1,020 ¥ 6,607       $ 1,016 6,877    
The allocation of the purchase price at the date of acquisition                  
Net assets acquired   2,874              
Goodwill   5,216              
Deferred tax assets   616              
Deferred tax liabilities   (1,027)              
Noncontrolling interests   (4,416)              
Total   ¥ 6,607              
Weighted average amortization period 2 years 6 months 2 years 6 months              
Capital injections       $ 770 ¥ 5,222 483 3,124    
Reduction in noncontrolling interest             1,681    
Addition to noncontrolling interest         400        
Lazada | Subsequent event                  
The allocation of the purchase price at the date of acquisition                  
Capital injections | $     $ 300            
Lazada | Certain management members and employees                  
Acquisition                  
Cash consideration for additional equity interest acquired       $ 20 ¥ 133 $ 87 ¥ 578    
Lazada | Maximum                  
The allocation of the purchase price at the date of acquisition                  
Estimated amortization periods 3 years 3 years              
Lazada | User base and customer relationships                  
The allocation of the purchase price at the date of acquisition                  
Amortizable intangible assets   ¥ 2,014              
Lazada | Non-compete agreements                  
The allocation of the purchase price at the date of acquisition                  
Amortizable intangible assets   959              
Lazada | Trade names, trademarks and domain names                  
The allocation of the purchase price at the date of acquisition                  
Amortizable intangible assets   292              
Lazada | Developed technology and patents                  
The allocation of the purchase price at the date of acquisition                  
Amortizable intangible assets   ¥ 79