Asset Retirement Obligations (Table)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation [Abstract]

Asset retirement obligations

In 2023 and 2022, UScellular performed a review of the assumptions and estimated future costs related to asset retirement obligations. The results of the review and other changes in asset retirement obligations during 2023 and 2022, were as follows:

	2023		2022
(Dollars in millions)
Balance at beginning of year	$	346	$	315
Additional liabilities accrued	8		4
Revisions in estimated cash outflows	(3)		11
Disposition of assets	(3)		(1)
Accretion expense	19		17
Balance at end of year	$	367	$	346