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Retirement Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2012 and 2011 (in millions):
 
Pension Benefits
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
104

 
$
97

 
$
208

 
$
192

Interest cost
191

 
189

 
382

 
379

Expected return on assets
(166
)
 
(165
)
 
(332
)
 
(328
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
3

 
3

 
7

 
7

Unrecognized net (gain) loss
63

 
39

 
124

 
76

Net periodic benefit cost
$
195

 
$
163

 
$
389

 
$
326

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

 
$
15

 
$
30

 
$
30

Interest cost
38

 
44

 
76

 
88

Expected return on assets
(4
)
 
(5
)
 
(8
)
 
(10
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
(7
)
 
(7
)
 
(14
)
 
(14
)
Unrecognized net (gain) loss
(2
)
 
(2
)
 
(4
)
 
(4
)
Net periodic benefit cost
$
40

 
$
45

 
$
80

 
$
90