Investments Accounted for Using the Equity Method - Additional Information (Detail) - CNY (¥)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
China Mobile Innovative Business Fund (Shenzhen) Partnership (Limited Partnership) [Member]
Disclosure of associates [line items]
Committed cash to joint venture	¥ 1,500,000,000
Percentage of equity interest	50.00%
Amount contributed to joint venture	¥ 1,256,000,000	¥ 1,134,000,000
Remaining commitment to joint venture	244,000,000	366,000,000
Contingent liabilities relating to interest in the joint ventures	0
SPD Bank [member]
Disclosure of associates [line items]
Fair value of investment	¥ 65,993,000,000	¥ 52,282,000,000
Percentage of fair value of investment below its carrying amount	31.20%	39.90%
Impairment on investment	¥ 0
True Corporation Public Company Limited ("True Corporation") [member]
Disclosure of associates [line items]
Fair value of investment	¥ 6,432,000,000	¥ 6,589,000,000
Percentage of fair value of investment below its carrying amount	9.20%	16.70%
Impairment on investment	¥ 0

Amount contributed to joint venture.

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Percentage of fair value of investment below on its carrying amount.

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- Definition

Remaining commitment to joint venture.

+ References

No definition available.

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- Definition

The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of contingent liabilities incurred in relation to interests in joint ventures. [Refer: Contingent liabilities [member]; Joint ventures [member]]

+ References

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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 investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates]

+ References

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- Definition

The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)]

+ References

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- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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