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Significant Accounting Policies - Summary of Impact of Transition to IFRS 9 on Retained Earnings and Reserves and Related Tax Impact (Detail) - IFRS 9 [member]
¥ in Millions
Jan. 01, 2018
CNY (¥)
Retained earnings [member]  
Disclosure of detailed information about financial instruments [line items]  
Transferred from fair value reserve (recycling) relating to financial assets now measured at fair value through profit or loss (FVPL) ¥ 30
Remeasurement of other investments in equity securities now measured at FVPL at January 1, 2018 23
Related tax (5)
Effect of the above changes on non-controlling interests (8)
Net increase in retained earnings at January 1, 2018 40
Fair value reserve (recycling) [member]  
Disclosure of detailed information about financial instruments [line items]  
Transferred to retained earnings relating to financial assets now measured at FVPL (30)
Transferred to fair value reserve (non-recycling) relating to equity securities now measured at fair value through other comprehensive income(FVOCI) (210)
Net decrease in fair value reserve (recycling) at January 1, 2018 (240)
Fair value reserve (non-recycling) [member]  
Disclosure of detailed information about financial instruments [line items]  
Transfer and remeasurement effect of other investments in equity securities now measured at FVOCI at January 1, 2018 334
Related tax (31)
Net increase in fair value reserve (non-recycling) at January 1, 2018 303
Non-controlling interests [member]  
Disclosure of detailed information about financial instruments [line items]  
Remeasurement of other investments in equity securities now measured at FVPL in non-controlling interests at January 1, 2018 ¥ 8