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Bank borrowings (Details)
¥ in Millions, $ in Millions
1 Months Ended 2 Months Ended 10 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
Apr. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jan. 31, 2014
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
Mar. 31, 2015
CNY (¥)
Nov. 30, 2014
CNY (¥)
Aug. 31, 2014
USD ($)
Mar. 31, 2014
CNY (¥)
Bank borrowings                      
Less: current portion         $ (321)     ¥ (1,990)     ¥ (1,100)
Borrowings, non-current portion         $ 260     1,609     30,711
Bank borrowings                      
Bank borrowings                      
Bank Borrowings               3,599      
Less: unamortized upfront fees                     (773)
Subtotal               3,599     31,811
Less: current portion               (1,990)     (1,100)
Borrowings, non-current portion               1,609     30,711
US$8.0 billion syndicated loan denominated in US$                      
Bank borrowings                      
Repayment of facility | $ $ 8,000                    
US$8.0 billion syndicated loan denominated in US$ | Bank facility | Denominated in U.S. dollars                      
Bank borrowings                      
Syndicated loan facility | $     $ 8,000     $ 8,000          
Bank Borrowings                     30,761
Repayment of facility | $ $ 8,000                    
US$8.0 billion syndicated loan denominated in US$ | Bank facility | Denominated in U.S. dollars | Interest expenses on the consolidated income statements                      
Bank borrowings                      
Less: unamortized upfront fees                 ¥ (830)    
US$8.0 billion syndicated loan, first drawdown of US$4.0 billion | Bank facility                      
Bank borrowings                      
Repayable period           3 years          
US$8.0 billion syndicated loan, first drawdown of US$4.0 billion | Bank facility | LIBOR                      
Bank borrowings                      
Spread over variable rate (as a percent)     1.75% 2.25%              
US$8.0 billion syndicated loan, first drawdown of US$4.0 billion | Bank facility | Denominated in U.S. dollars                      
Bank borrowings                      
Drawdown of facility | $           $ 4,000          
US$8.0 billion syndicated loan, second drawdown of US$1.0 billion | Bank facility                      
Bank borrowings                      
Repayable period           5 years          
US$8.0 billion syndicated loan, second drawdown of US$1.0 billion | Bank facility | LIBOR                      
Bank borrowings                      
Spread over variable rate (as a percent)     2.25% 2.75%              
US$8.0 billion syndicated loan, second drawdown of US$1.0 billion | Bank facility | Denominated in U.S. dollars                      
Bank borrowings                      
Drawdown of facility | $           $ 1,000          
US$8.0 billion syndicated loan, third drawdown of US$3.0 billion | Bank facility | Denominated in U.S. dollars                      
Bank borrowings                      
Drawdown of facility | $   $ 3,000                  
Long-term other borrowings | Other bank loans                      
Bank borrowings                      
Bank Borrowings               1,609     723
Weighted average interest rate for the year         5.90% 6.70% 6.30%        
Long-term other borrowings | Other bank loans | Land use rights and construction in progress                      
Bank borrowings                      
Collateral amount pledged               2,216     1,090
Short-term other borrowings | Other bank loans                      
Bank borrowings                      
Bank Borrowings               ¥ 1,990     ¥ 1,100
Short-term other borrowings | Other bank loans | Minimum                      
Bank borrowings                      
Interest rates     5.00%   2.00% 5.00%   2.00%     5.00%
Short-term other borrowings | Other bank loans | Maximum                      
Bank borrowings                      
Interest rates     6.00%   11.60% 6.00%   11.60%     6.00%
US$3.0 billion loan facility agreement | Bank facility                      
Bank borrowings                      
Syndicated loan facility | $                   $ 3,000