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Fair Value Of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Of Financial Instruments [Abstract]  
Fair Value Of Long-Term Debt



 

 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 

 

 

 

 



 

September 30, 2017

 

December 31, 2016



 

 

 

 

 

 

 

 

 

 

 

 

($ in millions)

 

 

Carrying Amount

 

 

Fair Value

 

 

Carrying Amount

 

 

Fair Value



 

 

 

 

 

 

 

 

 

 

 

 

Long-term debt

 

$

 17,604 

 

$

 15,515 

 

$

 17,560 

 

$

 17,539