Investments Accounted for Using the Equity Method - Summary of Investments Accounted for Using the Equity Method (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investments in subsidiaries, joint ventures and associates [abstract]
Associates	¥ 160,732	¥ 154,004
Joint ventures	1,079	1,224
Investments accounted for using the equity method	¥ 161,811	¥ 155,228

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The amount of investments in associates in an entity's separate financial statements. [Refer: Associates [member]]

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The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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