Severance (Tables)

12 Months Ended

Dec. 31, 2019

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, 2017	$	8
Accrued to expense	85
Payments, net	(60		)
Balance at December 31, 2018	33
Accrued to expense	66
Payments, net	(36		)
Balance at December 31, 2019	$	63