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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
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, 2012 and 2011 (in millions):
 
Pension Benefits
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
104

 
$
97

 
$
312

 
$
289

Interest cost
191

 
189

 
573

 
568

Expected return on assets
(166
)
 
(165
)
 
(498
)
 
(493
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
3

 
3

 
10

 
10

Unrecognized net (gain) loss
63

 
39

 
187

 
115

Net periodic benefit cost
$
195

 
$
163

 
$
584

 
$
489

 
Retiree Medical and Other Benefits
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
15

 
$
15

 
$
45

 
$
45

Interest cost
38

 
44

 
114

 
132

Expected return on assets
(4
)
 
(5
)
 
(12
)
 
(15
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
(7
)
 
(7
)
 
(21
)
 
(21
)
Unrecognized net (gain) loss
(2
)
 
(2
)
 
(6
)
 
(6
)
Net periodic benefit cost
$
40

 
$
45

 
$
120

 
$
135