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Goodwill And Other Intangibles
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Other Intangibles
Goodwill and Other Intangibles
The Company is required to assess goodwill and any indefinite-lived intangible assets for impairment annually, or more frequently if circumstances indicate impairment may have occurred. The Company performs the annual impairment assessment for each of its reporting units during the third quarter of each year. In accordance with applicable accounting guidance, the Company assesses qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. The Company considers numerous factors, which included that the fair value of each reporting unit exceeded its carrying value by a substantial margin in its most recent estimate of reporting unit fair values, whether significant acquisitions or dispositions occurred which might alter the fair value of its reporting units, macroeconomic conditions and their potential impact on reporting unit fair values, actual performance compared with budget and prior projections used in its estimation of reporting unit fair values, industry and market conditions, and the year-over-year change in the Company’s share price. The Company completed its qualitative assessment in the third quarter of 2016 and concluded that a two-step goodwill impairment test was not required in 2016 and that goodwill was not impaired.
Other intangible assets that are not deemed to have an indefinite life are amortized over their estimated lives and reviewed for impairment upon the occurrence of certain triggering events in accordance with applicable accounting literature.
Changes in the carrying amount of goodwill are as follows: 
(In millions of dollars)
2016

 
2015

Balance as of January 1, as reported
$
7,889

 
$
7,241

Goodwill acquired
556

 
783

Other adjustments(a)
(76
)
 
(135
)
Balance at December 31,
$
8,369

 
$
7,889


(a)
Primarily due to the impact of foreign exchange in both years.
The goodwill acquired of $556 million in 2016 (approximately $71 million of which is deductible for tax purposes) is comprised of $321 million related to the Risk and Insurance Services segment and $235 million related to the Consulting segment.
Goodwill allocable to the Company’s reportable segments is as follows: Risk and Insurance Services, $5.9 billion and Consulting, $2.5 billion.
The gross cost and accumulated amortization at December 31, 2016 and 2015 are as follows:
(In millions of dollars)
2016
 
2015


Gross
Cost

 
Accumulated
Amortization

 
Net
Carrying
Amount

 
Gross
Cost

 
Accumulated
Amortization

 
Net
Carrying
Amount

Client relationships
$
1,390

 
$
392

 
$
998

 
$
1,281

 
$
347

 
$
934

Other (a)
204

 
76

 
128

 
176

 
74

 
102

Amortized intangibles
$
1,594

 
$
468

 
$
1,126

 
$
1,457

 
$
421

 
$
1,036


(a) Primarily non-compete agreements, trade names and developed technology
Aggregate amortization expense was $130 million for the year ended December 31, 2016, $109 million for the year ended December 31, 2015 and $86 million for the year ended December 31, 2014. The estimated future aggregate amortization expense is as follows:
For the Years Ending December 31,
 
(In millions of dollars)
 
2017
$
148

2018
141

2019
134

2020
120

2021
107

Subsequent years
476

 
$
1,126