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Debt and Credit Agreements (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Activity Related to Long-Term Debt
Total activity related to long-term debt as of the end of second quarter 2021 is shown in the table below. For fair value information related to the Company's long-term debt, see Note 10, Fair Value Measurements.

(Dollars in millions)Current PortionLong-term PortionTotal
Long-term Debt as of December 31, 2020
$401 $16,304 $16,705 
2021 Activity:
Long-term Debt Repaid(360)— (360)
Reclassifications81 (81)— 
Discount, Premium and Other Activity— 
Long-term Debt as of June 30, 2021
$122 $16,229 $16,351