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Retirement Benefits and Trusteed Assets (Notes)
 3 Months Ended
Mar. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
RETIREMENT BENEFITS AND TRUSTEED ASSETS

The following table details the components of net periodic benefit costs for pension benefits and other postretirement benefits:
 
Pension Benefits
 
Other Postretirement Benefits
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31
(In millions)
Service cost
$
21

 
$
24

 
$
9

 
$
16

Interest cost
53

 
48

 
23

 
24

Expected return on plan assets
(68
)
 
(67
)
 
(31
)
 
(27
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
38

 
51

 
5

 
17

Prior service credit
—

 
—

 
(36
)
 
(23
)
Net periodic benefit cost (credit)
$
44

 
$
56

 
$
(30
)
 
$
7


Pension and Other Postretirement Contributions

During the first three months of 2014, the Company contributed $31 million to its pension plans. At the discretion of management, and depending upon financial market conditions, the Company may make up to an additional $160 million contribution to its pension plans in 2014.

At the discretion of management, the Company may make up to a $145 million contribution to its other postretirement benefit plans in 2014.