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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities
We present the carrying values and the fair values of noncurrent financial assets and liabilities that qualify as financial instruments, determined under current guidance for disclosures on the fair value of financial instruments, in the following table:
 
March 31, 2018
 
December 31, 2017
($ in millions)
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Senior, mezzanine, and other loans
$
147

 
$
133

 
$
142

 
$
130

Total noncurrent financial assets
$
147

 
$
133

 
$
142

 
$
130

 
 
 
 
 
 
 
 
Senior Notes
$
(4,487
)
 
$
(4,404
)
 
$
(5,087
)
 
$
(5,126
)
Commercial paper
(2,998
)
 
(2,998
)
 
(2,371
)
 
(2,371
)
Other long-term debt
(209
)
 
(211
)
 
(217
)
 
(221
)
Other noncurrent liabilities
(174
)
 
(174
)
 
(178
)
 
(178
)
Total noncurrent financial liabilities
$
(7,868
)
 
$
(7,787
)
 
$
(7,853
)
 
$
(7,896
)