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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic cost and weighted-average assumptions used to determine net cost
 
 
(Millions of dollars)
U.S. Pension 
Benefits
 
Non-U.S. Pension 
Benefits
 
Other
Postretirement 
Benefits
 
March 31,
 
March 31,
 
March 31,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
For the three months ended:
 
 
 
 
 
 
 
 
 
 
 
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
49

 
$
46

 
$
31

 
$
28

 
$
24

 
$
24

Interest cost
145

 
154

 
43

 
45

 
49

 
55

Expected return on plan assets
(208
)
 
(203
)
 
(59
)
 
(54
)
 
(14
)
 
(16
)
Amortization of:
 
 
 

 
 
 
 

 
 
 
 

Transition obligation (asset)
—

 
—

 
—

 
—

 
1

 
1

Prior service cost (credit) 1
4

 
5

 
—

 
—

 
(18
)
 
(17
)
Net actuarial loss (gain) 1
136

 
124

 
33

 
24

 
27

 
25

Net periodic benefit cost
126

 
126

 
48

 
43

 
69

 
72

Curtailments, settlements and special termination benefits 2
—

 
—

 
—

 
10

 
—

 
(40
)
Total cost included in operating profit
$
126

 
$
126

 
$
48

 
$
53

 
$
69

 
$
32

 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average assumptions used to determine net cost:
 
 
 
 
 
 
 
 
 
 
Discount rate
3.7
%
 
4.3
%
 
3.7
%
 
4.3
%
 
3.7
%
 
4.3
%
Expected return on plan assets
7.8
%
 
8.0
%
 
6.7
%
 
7.1
%
 
7.8
%
 
8.0
%
Rate of compensation increase
4.5
%
 
4.5
%
 
3.9
%
 
3.9
%
 
4.4
%
 
4.4
%
 
 
 
 
 
 
 
 
 
 
 
 

1 
Prior service cost (credit) and net actuarial loss (gain) for both pension and other postretirement benefits are generally amortized using the straight-line method over the average remaining service period to the full retirement eligibility date of employees expected to receive benefits from the plan. For pension and other postretirement benefit plans in which all or almost all of the plan's participants are inactive or fully eligible for benefits under the plan, respectively, prior service cost (credit) and net actuarial loss (gain) are amortized using the straight-line method over the remaining life expectancy of those participants.

2 
Curtailments, settlements and special termination benefits were recognized in Other operating (income) expenses in the Consolidated Statement of Results of Operations.
 
 
 
 
 
Company costs related to U.S. and non-U.S. defined contribution plans
Total company costs related to our defined contribution plans were as follows:
 
 
Three Months Ended
March 31,
 
(Millions of dollars)
2013
 
2012
 
U.S. Plans
$
83

 
$
101

 
Non-U.S. Plans
14

 
14

 
 
$
97

 
$
115