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Severance and Leased Real Estate (Tables)
 9 Months Ended
Sep. 30, 2017
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
19

 
3

Payments, net
(98
)
 
(9
)
Reversals and adjustments
—

 
—

Balance at September 30, 2017
$
19

 
61