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Fair Value (Unaudited) (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value [Abstract] 
Schedule of Carrying Amounts and Estimated Fair Values
                       

 

 

September 30, 2011

 

 

December 31, 2010

 

 

Carrying

Fair

 

 

Carrying

Fair

 

 

Amount

Value

 

 

Amount

Value

 

 

 

 

 

($ in millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term investments

$

152 

 

$

183 

 

$

192 

 

$

222 

Long-term debt, including current maturities

$

(6,837)

 

$

(8,757)

 

$

(6,925)

 

$

(7,971)