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Retirement Benefits and Trusteed Assets (Notes)
 9 Months Ended
Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Benefits and Trusted Assets 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 September 30,
(In millions)
Service cost
$
14

 
$
17

 
$
6

 
$
6

Interest cost
41

 
36

 
17

 
16

Expected return on plan assets
(48
)
 
(45
)
 
(21
)
 
(18
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
30

 
39

 
3

 
12

Prior service cost (credit)
—

 
1

 
(27
)
 
(27
)
Net periodic benefit cost (credit)
$
37

 
$
48

 
$
(22
)
 
$
(11
)

 
Pension Benefits
 
Other Postretirement Benefits
 
2014
 
2013
 
2014
 
2013
Nine Months Ended September 30,
(In millions)
Service cost
$
48

 
$
55

 
$
19

 
$
27

Interest cost
121

 
109

 
51

 
50

Expected return on plan assets
(145
)
 
(138
)
 
(63
)
 
(55
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
83

 
111

 
11

 
36

Prior service cost (credit)
1

 
1

 
(82
)
 
(72
)
Net periodic benefit cost (credit)
$
108

 
$
138

 
$
(64
)
 
$
(14
)

Pension and Other Postretirement Contributions

During the first nine months of 2014, the Company contributed $145 million to its pension plans.

At the discretion of management, the Company may make up to a $120 million contribution to its other postretirement benefit plans in 2014.