Goodwill (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill Disclosure [Abstract]

Schedule of changes in carrying amount of goodwill

The changes in the carrying amount of goodwill during the years ended December 31, 2014 and 2013 are as follows (dollars in millions):

	Total
Balance as of January 1, 2013	$	2,565
Goodwill adjustments	12
Balance as of December 31, 2013	2,577
Goodwill adjustments	(12		)
Goodwill acquired in tw telecom acquisition	5,124
Balance as of December 31, 2014	$	7,689