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Unsecured senior notes- General (Details)
¥ in Millions, $ in Millions
1 Months Ended
Nov. 30, 2021
USD ($)
Nov. 30, 2019
USD ($)
Nov. 30, 2017
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2022
CNY (¥)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
CNY (¥)
Feb. 28, 2021
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2014
USD ($)
Unsecured senior notes                    
Unsecured senior notes                    
Carrying value         ¥ 94,259   ¥ 107,212      
Unamortized discount and debt issuance costs         668   756      
Total principal amounts of unsecured senior notes         94,927   107,968      
Less: current portion of principal amounts of unsecured senior notes             (9,845)      
Non-current portion of principal amounts of unsecured senior notes         ¥ 94,927   ¥ 98,123      
2014 Senior Notes                    
Unsecured senior notes                    
Principal amount | $                   $ 8,000
Repayment amount | $ $ 1,500 $ 2,250 $ 1,300              
2017 Senior Notes                    
Unsecured senior notes                    
Principal amount | $                 $ 7,000  
2021 Senior Notes                    
Unsecured senior notes                    
Principal amount | $               $ 5,000    
US$1,500 million 3.125% notes due 2021 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,500   $ 1,500        
Fixed interest rate       3.125% 3.125% 3.125% 3.125%      
Carrying value             ¥ 9,831      
Effective interest rate       3.26% 3.26%          
US$700 million 2.800% notes due 2023 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 700   $ 700        
Fixed interest rate       2.80% 2.80% 2.80% 2.80%      
Carrying value         ¥ 4,439   ¥ 4,584      
Effective interest rate       2.90% 2.90%          
US$2,250 million 3.600% notes due 2024 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 2,250   $ 2,250        
Fixed interest rate       3.60% 3.60% 3.60% 3.60%      
Carrying value         ¥ 14,256   ¥ 14,724      
Effective interest rate       3.68% 3.68%          
US$2,550 million 3.400% notes due 2027 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 2,550   $ 2,550        
Fixed interest rate       3.40% 3.40% 3.40% 3.40%      
Carrying value         ¥ 16,091   ¥ 16,616      
Effective interest rate       3.52% 3.52%          
US$1,500 million 2.125% notes due 2031 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,500   $ 1,500        
Fixed interest rate       2.125% 2.125% 2.125% 2.125%      
Carrying value         ¥ 9,469   ¥ 9,782      
Effective interest rate       2.20% 2.20%          
US$700 million 4.500% notes due 2034 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 700   $ 700        
Fixed interest rate       4.50% 4.50% 4.50% 4.50%      
Carrying value         ¥ 4,400   ¥ 4,545      
Effective interest rate       4.60% 4.60%          
US$1,000 million 4.000% notes due 2037 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,000   $ 1,000        
Fixed interest rate       4.00% 4.00% 4.00% 4.00%      
Carrying value         ¥ 6,300   ¥ 6,510      
Effective interest rate       4.06% 4.06%          
US$1,000 million 2.700% notes due 2041 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,000   $ 1,000        
Fixed interest rate       2.70% 2.70% 2.70% 2.70%      
Carrying value         ¥ 6,256   ¥ 6,463      
Effective interest rate       2.80% 2.80%          
US$1,750 million 4.200% notes due 2047 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,750   $ 1,750        
Fixed interest rate       4.20% 4.20% 4.20% 4.20%      
Carrying value         ¥ 11,014   ¥ 11,382      
Effective interest rate       4.25% 4.25%          
US$1,500 million 3.150% notes due 2051 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,500   $ 1,500        
Fixed interest rate       3.15% 3.15% 3.15% 3.15%      
Carrying value         ¥ 9,448   ¥ 9,764      
Effective interest rate       3.19% 3.19%          
US$1,000 million 4.400% notes due 2057 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,000   $ 1,000        
Fixed interest rate       4.40% 4.40% 4.40% 4.40%      
Carrying value         ¥ 6,290   ¥ 6,501      
Effective interest rate       4.44% 4.44%          
US$1,000 million 3.250% notes due 2061 | Unsecured senior notes                    
Unsecured senior notes                    
Principal amount | $       $ 1,000   $ 1,000        
Fixed interest rate       3.25% 3.25% 3.25% 3.25%      
Carrying value         ¥ 6,296   ¥ 6,510      
Effective interest rate       3.28% 3.28%