Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

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 nine months ended September 30, 2016 are as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of January 1, 2016	$	5,593		$	2,855		$	8,448
Goodwill related to current year acquisitions	112			5			117
Goodwill related to disposals	(7		)	(26		)	(33		)
Goodwill related to prior year acquisitions	2			—			2
Foreign currency translation	(56		)	(26		)	(82		)
Balance as of September 30, 2016	$	5,644		$	2,808		$	8,452

Schedule of other intangible assets by asset class

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

	September 30, 2016						December 31, 2015
	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	2,913		1,945		968		2,886		1,809		1,077
Technology and other	540		489		51		541		457		84
Total	$	4,472	$	2,434	$	2,038	$	4,446	$	2,266	$	2,180

Schedule of estimated future amortization expense on intangible assets

The estimated future amortization for finite lived intangible assets as of September 30, 2016 is as follows (in millions):

	Risk Solutions		HR Solutions		Total
Remainder of 2016	$	26	$	40	$	66
2017	99		134		233
2018	87		90		177
2019	76		73		149
2020	66		60		126
Thereafter	155		113		268
Total	$	509	$	510	$	1,019