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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill by operating segment
The changes in the carrying amount of goodwill by reporting unit for the years ended December 31, 2014 and 2013, are as follows:
 
Willis GB
 
Willis Capital, Wholesale & Reinsurance
 
Willis North America
 
Willis International
 
Total
 
(millions)
Balance at January 1, 2013
 
 
 
 
 
 
 
 
 
Goodwill, gross
$
538

 
$
850

 
$
1,573

 
$
358

 
$
3,319

Accumulated impairment losses
—

 
—

 
(492
)
 
—

 
(492
)
Goodwill, net
538

 
850

 
1,081

 
358

 
2,827

Purchase price allocation adjustments
—

 
—

 
(1
)
 
—

 
(1
)
Goodwill acquired during the year
15

 
—

 
—

 
1

 
16

Goodwill disposed of during the year
—

 
—

 
(14
)
 
—

 
(14
)
Other movements
—

 
—

 
(1
)
 
—

 
(1
)
Foreign exchange
2

 
1

 
—

 
8

 
11

Balance at December 31, 2013
 
 
 
 
 
 
 
 


Goodwill, gross
555

 
851

 
1,557

 
367

 
3,330

Accumulated impairment losses
—

 
—

 
(492
)
 
—

 
(492
)
Goodwill, net
$
555

 
$
851

 
$
1,065

 
$
367

 
$
2,838

Purchase price allocation adjustments
3

 
—

 
3

 
7

 
13

Goodwill acquired during the year
—

 
5

 
—

 
179

 
184

Goodwill disposed of during the year
—

 
—

 
(48
)
 
—

 
(48
)
Foreign exchange
(3
)
 
(4
)
 
—

 
(43
)
 
(50
)
Balance at December 31, 2014
 
 
 
 
 
 
 
 


Goodwill, gross
555

 
852

 
1,512

 
510

 
3,429

Accumulated impairment losses
—

 
—

 
(492
)
 
—

 
(492
)
Goodwill, net
$
555

 
$
852

 
$
1,020

 
$
510

 
$
2,937


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