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Debt and Credit Agreements (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Activity Related to Long-Term Debt
Total activity related to long-term debt as of the end of first 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)
Discount, Premium and Other Activity— 
Long-term Debt as of March 31, 2021$41 $16,306 $16,347