Severance (Tables)

12 Months Ended

Dec. 31, 2020

Restructuring and Related Activities [Abstract]

Schedule of changes in accrued liability for severance expenses

Changes in our accrued liability for severance expenses were as follows:

	Severance
	(Dollars in millions)
Balance at December 31, 2018	$	33
Accrued to expense	66
Payments, net	(36)
Balance at December 31, 2019	63
Accrued to expense	17
Payments, net	(53)
Balance at December 31, 2020	$	27