Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the net carrying amount of goodwill by operating segment

The changes in the net carrying amount of goodwill by reportable segment for the years ended December 31, 2014 and 2013, respectively, are as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of January 1, 2013	$	5,982		$	2,961		$	8,943
Goodwill related to acquisitions	36			2			38
Goodwill related to disposals	(9		)	(3		)	(12		)
Goodwill related to other prior year acquisitions	(2		)	17			15
Foreign currency translation	13			—			13
Balance as of December 31, 2013	$	6,020		$	2,977		$	8,997
Goodwill related to acquisitions	287			5			292
Goodwill related to disposals	(14		)	—			(14		)
Goodwill related to other prior year acquisitions	(8		)	—			(8		)
Transfer	(2		)	2			—
Foreign currency translation	(372		)	(35		)	(407		)
Balance as of December 31, 2014	$	5,911		$	2,949		$	8,860

Schedule of other intangible assets by asset class

Other intangible assets by asset class are as follows (in millions):

	As of December 31
	2014						2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,019	$	—	$	1,019	$	1,019	$	—	$	1,019
Intangible assets with finite lives:
Customer related and contract based	2,952		1,579		1,373		2,720		1,310		1,410
Technology and other	571		443		128		584		435		149
	$	4,542	$	2,022	$	2,520	$	4,323	$	1,745	$	2,578

Schedule of estimated future amortization expense on intangible assets

The estimated future amortization for finite lived intangible assets as of December 31, 2014 is as follows (in millions):

	Risk Solutions		HR Solutions		Total
2015	$	113	$	209	$	322
2016	103		175		278
2017	93		139		232
2018	80		92		172
2019	69		74		143
Thereafter	186		168		354
	$	644	$	857	$	1,501