Aon plc | 2013 | FY | 3

The changes in the net carrying amount of goodwill by operating segment for the years ended December 31, 2013 and 2012, respectively, are as follows (in millions):
 
Risk
Solutions
 
HR
Solutions
 
Total
Balance as of January 1, 2012
$
5,557

 
$
3,213

 
$
8,770

Goodwill related to acquisitions
49

 
47

 
96

Goodwill related to disposals
(1
)
 
—

 
(1
)
Goodwill related to other prior year acquisitions
(6
)
 
—

 
(6
)
Transfers (1)
313

 
(313
)
 
—

Foreign currency translation
70

 
14

 
84

Balance as of December 31, 2012
$
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

(1)
Effective January 1, 2012, the Health and Benefits Consulting business was transferred from the HR Solutions segment to the Risk Solutions segment.

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