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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis, Non-Pension
The following tables summarize our non-pension financial assets and liabilities recorded at fair value on a recurring basis (at least annually) as of the dates presented (in millions):
 
 
September 30, 2011
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Derivative assets(A)
$
79

 
$
—

 
$
79

 
$
—

Derivative liabilities(A)
$
27

 
$
—

 
$
27

 
$
—

 
December 31, 2010
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Derivative assets(A)
$
29

 
$
—

 
$
29

 
$
—

Derivative liabilities(A)
$
25

 
$
—

 
$
25

 
$
—

 ___________________________
(A) 
We calculate derivative asset and liability amounts using a variety of valuation techniques, depending on the specific characteristics of the hedging instrument, taking into account credit risk. Refer to Note 5.