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Incentive Plans and Deferred Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Compensation Related Costs [Abstract]  
Schedule of awards, payments, deferrals and liabilities under the annual incentive plan, long term incentive plan and deferred compensation plans for officers and outside directors
(in millions)
 
Erie Insurance Group
 
 
2012

 
2011

 
2010

Awards, employer match and hypothetical earnings by plan:
 
 

 
 

 
 

Long-term incentive plan awards
 
$
5

 
$
9

 
$
7

Annual incentive plan awards
 
5

 
3

 
4

Deferred compensation plans, employer match and hypothetical earnings
 
1

 
1

 
2

Total plan awards and earnings
 
11

 
13

 
13

Total plan awards paid
 
(8
)
 
(10
)
 
(6
)
Compensation deferred under the plans
 
0

 
0

 
1

Distributions from the deferred compensation plans
 
(1
)
 
(1
)
 
(1
)
Gross incentive plan and deferred compensation liabilities at end of period
 
$
26

 
$
24

 
$
22