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Significant Acquisition And Equity Transactions (Details 4)
$ / shares in Units, ¥ in Millions, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2014
shares
Sep. 30, 2012
USD ($)
$ / shares
shares
Sep. 30, 2012
CNY (¥)
shares
Mar. 31, 2015
USD ($)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Mar. 31, 2013
USD ($)
Mar. 31, 2013
CNY (¥)
Initial Repurchase of Ordinary Shares from Yahoo                
Cash paid for repurchase of ordinary shares       $ 44 ¥ 270 ¥ 157   ¥ 40,111
Payment | ¥               3,487
Proceeds from issuance of ordinary shares   $ 2,600 ¥ 16,400          
Convertible Preference Shares                
Initial Repurchase of Ordinary Shares from Yahoo                
Value of preferred stock issued to finance Initial Repurchase and TIPLA amendment payment   $ 1,700 10,700          
Issuance cost | ¥     ¥ 157          
Initial conversion price (in dollars per share) | $ / shares   $ 18.50            
Convertible Preference Shares | Prior to the second anniversary of the issuance date                
Initial Repurchase of Ordinary Shares from Yahoo                
Dividend rate per annum   2.00% 2.00%          
Convertible Preference Shares | Second anniversary of the issuance date until the mandatory redemption date                
Initial Repurchase of Ordinary Shares from Yahoo                
Dividend rate per annum   5.00% 5.00%          
Convertible Preference Shares | After the mandatory redemption date                
Initial Repurchase of Ordinary Shares from Yahoo                
Dividend rate per annum   8.00% 8.00%          
Redeemable Preference Shares                
Initial Repurchase of Ordinary Shares from Yahoo                
Dividends recognized as interest expense | ¥           ¥ 96   271
Redeemable Preference Shares | Maximum                
Initial Repurchase of Ordinary Shares from Yahoo                
Dividend rate per annum   10.00% 10.00%          
Redeemable Preference Shares | Minimum                
Initial Repurchase of Ordinary Shares from Yahoo                
Cash dividend rate per annum   3.00% 3.00%          
Yahoo | Initial Repurchase                
Initial Repurchase of Ordinary Shares from Yahoo                
Ordinary shares repurchased (in shares)   523 523          
Total consideration for repurchase of ordinary shares   $ 7,100 ¥ 44,900       $ 7,100 44,900
Cash paid for repurchase of ordinary shares   6,300 39,800          
Yahoo | Initial Repurchase | Redeemable Preference Shares                
Initial Repurchase of Ordinary Shares from Yahoo                
Value of preferred stock issued to finance Initial Repurchase and TIPLA amendment payment   $ 800 ¥ 5,100       $ 800 5,100
Yahoo | Repurchase agreement, as amended | Maximum                
Initial Repurchase of Ordinary Shares from Yahoo                
Number of shares that Yahoo must sell or transfer (in shares)   140 140          
Yahoo | Repurchase agreement, as amended | ADS                
Initial Repurchase of Ordinary Shares from Yahoo                
Ordinary shares repurchased (in shares) 140              
Yahoo | Repurchase agreement, as amended | Ordinary shares                
Initial Repurchase of Ordinary Shares from Yahoo                
Ordinary shares repurchased (in shares) 140              
Yahoo | TIPLA amendment payment                
Initial Repurchase of Ordinary Shares from Yahoo                
Payment   $ 550 ¥ 3,487         ¥ 3,487