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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following tables set forth the components of net period benefit cost of the Partnership’s pension and other postretirement benefit plans:
 
Three Months Ended March 31,
 
2014
 
2013
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
2

 
$
—

Interest cost
8

 
1

 
9

 
2

Expected return on plan assets
(11
)
 
(2
)
 
(15
)
 
(3
)
Actuarial (gain) loss amortization
(1
)
 
—

 
1

 
—

Settlement credits
(1
)
 
—

 
(2
)
 
—

 
(5
)
 
(1
)
 
(5
)
 
(1
)
Regulatory adjustment
—

 
—

 
2

 
—

Net periodic benefit cost
$
(5
)
 
$
(1
)
 
$
(3
)
 
$
(1
)