Long-Term Time Deposits and Held-to-Maturity Investments - Summary of Estimated Amortized Cost of Long Term Time Deposits and Held-to-Maturity Investments (Detail) - Long Term Time Deposits And Held To Maturity Investments [Member] - Corporate Debt Securities ¥ in Millions, $ in Millions	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Schedule of Held-to-Maturity Securities [Line Items]
Due in 1 year through 2 years	¥ 91,795	$ 13,126	¥ 30,556
Due in 2 years through 3 years	8,165	1,168	67,979
Due in 3 years through 5 years	23,902	3,418	0
Total	¥ 123,862	$ 17,712	¥ 98,535

Long-Term Time Deposits and Held-to-Maturity Investments - Summary of Estimated Amortized Cost of Long Term Time Deposits and Held-to-Maturity Investments (Detail) - Long Term Time Deposits And Held To Maturity Investments [Member] - Corporate Debt Securities
¥ in Millions, $ in Millions

Dec. 31, 2025

CNY (¥)

Dec. 31, 2025

USD ($)

Dec. 31, 2024

CNY (¥)

Schedule of Held-to-Maturity Securities [Line Items]

Due in 1 year through 2 years

¥ 91,795

$ 13,126

¥ 30,556

Due in 2 years through 3 years

8,165

1,168

67,979

Due in 3 years through 5 years

23,902

3,418

Total

¥ 123,862

$ 17,712

¥ 98,535

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

+ Details