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Fair Value of Financial Instruments and Risk Management (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of carrying values and estimated fair values of financial instruments The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in our condensed consolidated balance sheets are provided in the following table.
June 30, 2021December 31, 2020
Dollars in millionsCarrying ValueFair ValueCarrying ValueFair Value
Liabilities (including current maturities):
Term Loan A
Level 2$281 $281 $285 $285 
Term Loan B
Level 2514 513 516 517 
Convertible Notes
Level 2350 543 350 480 
Senior Notes
Level 2250 251 250 262 
Senior Credit FacilityLevel 2`260 260 260 260 
Nonrecourse project debt
Level 2
Schedule of derivatives instruments statements of financial performance and financial position, location
The following table summarizes the recognized changes in fair value of our balance sheet hedges offset by remeasurement of balance sheet positions. These amounts are recognized in our condensed consolidated statements of operations for the periods presented. The net of our changes in fair value of hedges and the remeasurement of our assets and liabilities is included in "Other non-operating income (expense)" on our condensed consolidated statements of operations.

Three Months EndedSix Months Ended
June 30,June 30,
Gains (losses) dollars in millions2021202020212020
Balance Sheet Hedges - Fair Value$(1)$(1)$(1)$— 
Balance Sheet Position - Remeasurement— (5)
Net$— $(1)$(6)$
Schedule of sale of receivables activity
Activity for third-party financial institutions consisted of the following:
Six Months Ended
Dollars in millionsJune 30, 2021
Sale of receivables553 
Settlement of receivables(434)
Cash collected, not yet remitted— 
Outstanding balances sold to financial institutions$119