Investments Accounted for Using the Equity Method - Summary of Investments Accounted for Using the Equity Method (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Investments in subsidiaries, joint ventures and associates [abstract]
Associates	¥ 154,004	¥ 142,843	¥ 144,059
Joint ventures	1,224	1,266	1,266
Investments accounted for using the equity method	¥ 155,228	¥ 144,109	¥ 145,325

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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