Asset Retirement Obligations (Table)

12 Months Ended

Dec. 31, 2016

Asset Retirement Obligations [Abstract]

Asset retirement obligations

In 2016 and 2015, U.S. Cellular performed a review of the assumptions and estimated costs related to its asset retirement obligations.  The results of the reviews (identified as “Revisions in estimated cash outflows”) and other changes in asset retirement obligations during 2016 and 2015 were as follows:

		2016		2015
(Dollars in millions)
Balance at beginning of year		$	158	$	152
	Additional liabilities accrued		1		2
	Revisions in estimated cash outflows		5		(1)
	Disposition of assets		(1)		(6)
	Accretion expense		11		11
Balance at end of year		$	174	$	158