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Severance and Leased Real Estate (Tables)
 12 Months Ended
Dec. 31, 2018
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 and leased real estate were as follows:
 
Severance
 
Real Estate
 
(Dollars in millions)
Balance at December 31, 2016
$
98

 
67

Accrued to expense
42

 
4

Liabilities assumed in acquisition of Level 3
1

 
4

Payments, net
(108
)
 
(13
)
Reversals and adjustments
—

 
2

Balance at December 31, 2017
33

 
64

Accrued to expense
205

 
70

Payments, net
(151
)
 
(24
)
Balance at December 31, 2018
$
87

 
110