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Unsecured senior notes- General (Details)
¥ in Millions, $ in Millions
1 Months Ended
Nov. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Nov. 30, 2014
USD ($)
Unsecured senior notes              
Unsecured senior notes              
Carrying value     ¥ 91,517   ¥ 85,372    
Unamortized discount and debt issuance costs     589   624    
Total principal amounts of unsecured senior notes     92,106   85,996    
Less: current portion of principal amounts of unsecured senior notes     (15,127)        
Non-current portion of principal amounts of unsecured senior notes     76,979   ¥ 85,996    
Discount when issued   $ 47 297        
Debt issuance costs as a direct deduction from the principal amount   82 ¥ 517        
2014 Senior Notes              
Unsecured senior notes              
Principal amount | $             $ 8,000
Repayment amount | $ $ 1,300            
2017 Senior Notes              
Unsecured senior notes              
Principal amount | $           $ 7,000  
US$2,250 million 2.500% notes due 2019 | Unsecured senior notes              
Unsecured senior notes              
Principal amount | $   $ 2,250   $ 2,250      
Fixed interest rate   2.50% 2.50% 2.50% 2.50%    
Carrying value     ¥ 15,110   ¥ 14,083    
Effective interest rate   2.67% 2.67% 2.67% 2.67%    
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     ¥ 10,044   ¥ 9,365    
Effective interest rate   3.26% 3.26% 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     ¥ 4,687   ¥ 4,372    
Effective interest rate   2.90% 2.90% 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     ¥ 15,061   ¥ 14,050    
Effective interest rate   3.68% 3.68% 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     ¥ 16,989   ¥ 15,848    
Effective interest rate   3.52% 3.52% 3.52% 3.52%    
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     ¥ 4,650   ¥ 4,339    
Effective interest rate   4.60% 4.60% 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     ¥ 6,663   ¥ 6,219    
Effective interest rate   4.06% 4.06% 4.06% 4.06%    
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     ¥ 11,655   ¥ 10,880    
Effective interest rate   4.25% 4.25% 4.25% 4.25%    
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     ¥ 6,658   ¥ 6,216    
Effective interest rate   4.44% 4.44% 4.44% 4.44%