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Fair Value Measurements - Committed Financing (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Jun. 08, 2023
Priveterra \| Intangible Assets of Old Aeon Acquired [Member]
Fair Value Measurements
Shares issued for Committed Financing (in shares)	2,226,182
Additional Committed Financing Agreement with A1 \| Priveterra \| Intangible Assets of Old Aeon Acquired [Member]
Fair Value Measurements
Aggregate principal amount			$ 20
Notes Issued		$ 14
Proceeds from issuance of convertible notes		$ 25
Additional Committed Financing Agreement with A1 \| Class A member \| Priveterra
Fair Value Measurements
Number of shares issued upon conversion		2,226,182
Committed Financing Arrangements \| Class A member
Fair Value Measurements
Number of shares issued upon conversion		3,571,429
Conversion price of convertible debt		$ 7.00
A1 and Daewoong \| Priveterra \| Intangible Assets of Old Aeon Acquired [Member]
Fair Value Measurements
Aggregate principal amount	$ 15
Priveterra and Old AEON \| Priveterra \| Intangible Assets of Old Aeon Acquired [Member]
Fair Value Measurements
Aggregate principal amount	$ 5