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Income Tax Expenses - Summary of Reconciliation from Income Tax Calculated Based on the Applicable Tax Rates and Profit before Income Tax Expenses (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Profit before income tax expenses ¥ 23,400,178 ¥ 17,909,505 ¥ 19,433,841
Income tax calculated at the PRC statutory tax rate of 25% 5,850,045 4,477,376 4,858,460
Tax effect of:      
Reversal of deferred tax assets recognized in prior years 381,456 3,643 190,104
Differential income tax rates applicable to subsidiaries (Note a, b, c, d and e) 263,707 756,392 350,051
Expenses and losses not deductible for tax purposes 245,097 262,843 530,638
Deductible temporary differences and tax losses for which no deferred tax asset was recognized 210,748 280,251 244,187
Income not subject to tax (19,640) (99,378) (36,536)
Utilization of previously unrecognized deferred tax assets (24,649) (14,711) (5,163)
Research and development tax credit (39,038) (38,680)  
Effect of tax rate changes on deferred income taxes (42,929)   (37,959)
Others (133,679) 5,529 22,915
Income tax expense ¥ 6,691,118 ¥ 5,633,265 ¥ 6,116,697