Goodwill (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013 and 2012 are as follows (dollars in millions):

	Total
Balance as of January 1, 2012	$	2,541
Goodwill adjustments	24
Balance as of December 31, 2012	2,565
Goodwill adjustments	12
Balance as of December 31, 2013	$	2,577