Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

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, 2012 and 2011 are as follows (dollars in millions):

	Total
Balance as of January 1, 2011	$	1,427
Goodwill acquired in Global Crossing acquisition	1,110
Effect of foreign currency rate change	4
Balance as of December 31, 2011	2,541
Goodwill adjustments	24
Balance as of December 31, 2012	$	2,565