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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Benefit Cost
The following tables provide the components of net periodic benefit cost for the three and nine months ended September 30, 2013 and 2012 (in millions):
 
Pension Benefits
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
1

 
$
104

 
$
3

 
$
312

Interest cost
164

 
191

 
490

 
573

Expected return on assets
(180
)
 
(166
)
 
(540
)
 
(498
)
Amortization of:
 
 
 
 
 
 
 
    Prior service cost
7

 
3

 
21

 
10

    Unrecognized net (gain) loss
23

 
63

 
69

 
187

Net periodic benefit cost
$
15

 
$
195

 
$
43

 
$
584

 
Retiree Medical and Other Benefits
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
—

 
$
15

 
$
—

 
$
45

Interest cost
13

 
38

 
39

 
114

Expected return on assets
(4
)
 
(4
)
 
(12
)
 
(12
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
(61
)
 
(7
)
 
(183
)
 
(21
)
Unrecognized net (gain) loss
(2
)
 
(2
)
 
(6
)
 
(6
)
Net periodic benefit cost
$
(54
)
 
$
40

 
$
(162
)
 
$
120