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Severance (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2010 (Predecessor)
$
28

Accrued to expense
3

Payments, net
(11
)
Reversals and adjustments
(1
)
Balance at March 31, 2011 (Predecessor)
$
19

Fair value adjustment
(2
)
Balance at April 1, 2011 (Successor)
$
17

Accrued to expense
118

Payments, net
(97
)
Reversals and adjustments
(9
)
Balance at December 31, 2011 (Successor)
$
29

Accrued to expense
64

Payments, net
(85
)
Reversals and adjustments
(1
)
Balance at December 31, 2012 (Successor)
$
7

Accrued to expense
10

Payments, net
(12
)
Reversals and adjustments
—

Balance at December 31, 2013 (Successor)
$
5