Fair Value Measurement of Financial Instruments - Analysis of Fair Value Measurement of Financial Assets (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Fair value gains recognized in profit or loss	¥ 5,495	¥ 4,442	¥ 2,999
less:current portion	(114,259)	(76,425)
Non-current portion	513	587
Financial assets at fair value through other comprehensive income, category [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	587
Fair value gains recognized in other comprehensive income, before tax	(74)
Ending balance	513
Non-current portion	513	587
Financial assets at fair value through profit or loss, category [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	76,926
Addition	161,343
Maturity	(129,505)
Fair value gains recognized in profit or loss	5,495
Ending balance	114,259
less:current portion	¥ (114,259)	(76,425)
Non-current portion		¥ 501

The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 7
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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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The amount of non-current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income]

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The amount of non-current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

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The decrease in the fair value measurement of assets resulting from settlements. [Refer: At fair value [member]]

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