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Severance (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Schedule of changes in accrued liabilities for severance expenses and leased real estate Changes in our accrued liabilities for severance expenses were as follows:
Severance
 (Dollars in millions)
Balance at December 31, 2018$87 
Accrued to expense89 
Payments, net(87)
Balance at December 31, 201989 
Accrued to expense151 
Payments, net(137)
Balance at December 31, 2020$103