MARATHON OIL CORP | 2013 | FY | 3


Plan assumptions – The following summarizes the assumptions used to determine the benefit obligations at December 31, and net periodic benefit cost for the defined benefit pension and other postretirement plans for 2013, 2012 and 2011.
 
Pension Benefits
 
 
 
 
 
 
 
2013
 
2012
 
2011
 
Other Benefits
(In millions)
U.S.
 
Int’l
 
U.S.
 
Int’l
 
U.S.
 
Int’l
 
2013
 
2012
 
2011
Weighted average assumptions used to determine benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.28
%
 
4.60
%
 
3.44
%
 
4.40
%
 
4.45
%
 
4.70
%
 
4.85
%
 
4.06
%
 
4.90
%
Rate of compensation increase
5.00
%
 
4.90
%
 
5.00
%
 
4.50
%
 
5.00
%
 
4.30
%
 
5.00
%
 
5.00
%
 
5.00
%
Weighted average assumptions used to determine net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
3.79
%
 
4.40
%
 
4.21
%
 
4.70
%
 
5.05
%
 
5.40
%
 
4.06
%
 
4.90
%
 
5.55
%
Expected long-term return on plan assets
7.25
%
(a) 
4.90
%
 
7.75
%
 
5.20
%
 
8.50
%
 
5.86
%
 

 

 

Rate of compensation increase
5.00
%
 
4.50
%
 
5.00
%
 
4.30
%
 
5.00
%
 
5.10
%
 
5.00
%
 
5.00
%
 
5.00
%

(a)
Effective January 1, 2014, the expected long-term return on U.S. plan assets was changed from 7.25 percent to 6.75 percent.

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