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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
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, 2021December 31, 2020
($ in millions)Carrying AmountFair ValueCarrying AmountFair Value
Senior, mezzanine, and other loans$162 $146 $159 $142 
Total noncurrent financial assets$162 $146 $159 $142 
Senior Notes$(8,716)$(9,404)$(8,031)$(8,941)
Commercial paper / Credit Facility(400)(400)(900)(900)
Other long-term debt(126)(128)(126)(128)
Other noncurrent liabilities(426)(426)(426)(426)
Total noncurrent financial liabilities$(9,668)$(10,358)$(9,483)$(10,395)