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Intangible assets (Details) $ in Millions	12 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2015 CNY (¥)	Mar. 31, 2014 CNY (¥)	Mar. 31, 2013 CNY (¥)	Mar. 31, 2015 CNY (¥)
Intangible assets
Less: accumulated amortization and impairment			¥ (1,217,000,000)		¥ (3,543,000,000)
Net book value	$ 1,061		1,906,000,000		6,575,000,000
Amortization of intangible assets	$ 337	¥ 2,089,000,000	315,000,000	¥ 130,000,000
Impairment charge		¥ 0	0	¥ 18,000,000
Non-compete agreements
Intangible assets
Gross carrying amount			1,050,000,000		3,630,000,000
Developed technology and patents
Intangible assets
Gross carrying amount			1,041,000,000		3,331,000,000
Trade names, trademarks and domain names
Intangible assets
Gross carrying amount			768,000,000		2,007,000,000
User base and customer relationships
Intangible assets
Gross carrying amount			¥ 264,000,000		855,000,000
Copyrights and other
Intangible assets
Gross carrying amount					¥ 295,000,000

X

- Definition

Accumulated amount of amortization of assets and the amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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