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Fair Value Of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2015
Fair Value Of Financial Instruments [Abstract]  
Fair Value Of Long-Term Debt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

($ in millions)

 

September 30, 2015

 

December 31, 2014

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Carrying Amount

 

 

Fair Value

 

 

Carrying Amount

 

 

Fair Value

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term debt

 

$
16,016 

 

$
14,779 

 

$
9,486 

 

$
10,034