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Fair value measurement - Investment securities (Details) ¥ in Thousands, $ in Thousands		12 Months Ended
	Dec. 20, 2017 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)
Investment securities
Cost Basis		¥ 9,087,935	¥ 1,181,710
Gross Unrealized Gains		1,476,834	116,434
Gross Unrealized Losses		(513,047)	(37,551)
Provision for decline in value		(23,909)	(200,961)
Fair Value		10,027,813	1,059,632
Impairment charges of available-for-sale investments		23,909	¥ 200,961
BlueFocus
Investment securities
Percentage of outstanding ordinary shares subscribed or held			0.80%
Total consideration for the investment			¥ 200,000
Lexin Group
Investment securities
Gross Unrealized Gains		1,109,481
Fair Value		1,357,229
Total consideration for the investment	¥ 29,730			$ 33,000
China Unicom
Investment securities
Gross Unrealized Losses		¥ (366,032)
Percentage of outstanding ordinary shares subscribed or held		2.40%
Total consideration for the investment		¥ 5,000,000
Vipshop
Investment securities
Gross Unrealized Losses		¥ (37,064)
Percentage of outstanding ordinary shares subscribed or held		5.50%
Total consideration for the investment		¥ 2,794,547
RMB | Lexin Group
Investment securities
Total consideration for the investment	¥ 218,018
Others, net
Investment securities
Impairment losses related to cost method investments		59,987	341,984		¥ 285,051
Others, net | Nonrecurring basis | Significant Unobservable Inputs (Level 3)
Investment securities
Impairment losses related to cost method investments		¥ 59,987	¥ 341,984		¥ 285,051

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Amount of accumulated provision for decline in value of available-for-sale equity securities.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

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