The changes in the carrying amount of goodwill for the three months ended March 31, 2024 are as follows (in millions):


Balance, as of December 31, 2023
Goodwill	$	6,772
Accumulated impairment losses		(2,814	)
		3,958
Goodwill acquired as part of acquisitions during current year		—
Goodwill allocated to hospitals divested or held-for-sale		(1	)
Balance, as of March 31, 2024
Goodwill		6,771
Accumulated impairment losses		(2,814	)
	$	3,957

Goodwill is allocated to each identified reporting unit, which is defined as an operating segment or one level below the operating segment (referred to as a component of the entity). Management has determined that the Company’s operating segment meets the criteria to be classified as a reporting unit.

Goodwill is evaluated for impairment annually and when an event occurs or circumstances change that, more likely than not, reduce the fair value of the reporting unit below its carrying value. The Company performed its last annual goodwill impairment evaluation during the fourth quarter of 2023 using an October 31, 2023 measurement date, which indicated no impairment.

The determination of fair value in the Company’s goodwill impairment analysis is based on an estimate of fair value for the reporting unit utilizing known and estimated inputs at the evaluation date. Some of those inputs include, but are not limited to, the most recent price of the Company’s common stock and fair value of long-term debt, the Company’s recent financial results, estimates of future revenue and expense growth, estimated market multiples, expected capital expenditures, income tax rates, costs of invested capital and a discount rate.

Future estimates of fair value could be adversely affected if the actual outcome of one or more of the assumptions described above changes materially in the future, including as a result of any decline in the Company’s stock price and the fair value of its long-term debt, an increase in the volatility of the Company’s stock price and the fair value of its long-term debt, lower-than-expected hospital volumes and/or net operating revenues, higher market interest rates, increased operating costs or other adverse impacts on the Company’s financial results. Such changes impacting the calculation of fair value could result in a material impairment charge in the future.