| Cover | Mar. 06, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 06, 2023 |
| Entity File Number | 001-40006 |
| Entity Registrant Name | HH&L Acquisition Co. |
| Entity Central Index Key | 0001824185 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | Suite 2001-2002, 20/F, |
| Entity Address, Address Line Two | York House |
| Entity Address, Address Line Three | The Landmark, 15 Queen’s Road Central |
| Entity Address, City or Town | Central |
| Entity Address, Country | HK |
| Entity Address, Postal Zip Code | 00000 |
| City Area Code | 852 |
| Local Phone Number | 3752 2870 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Class A ordinary shares, par value $0.0001 per share [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | HHLA |
| Security Exchange Name | NYSE |
| Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share |
| Trading Symbol | HHLA WS |
| Security Exchange Name | NYSE |
| Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant |
| Trading Symbol | HHLA.U |
| Security Exchange Name | NYSE |
