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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations [Table Text Block]
The following table provides asset retirement obligation activity for the years ended December 31, 2012 and 2011 (dollars in millions):
 
 
2012
 
2011
Asset retirement obligation at January 1
 
$
121

 
$
74

Accretion expense
 
11

 
9

Liabilities assumed in Global Crossing acquisition
 
—

 
41

Liabilities settled
 
(4
)
 
(2
)
Revision in estimated cash flows
 
(73
)
 
—

Effect of foreign currency rate change
 
—

 
(1
)
Asset retirement obligation at December 31
 
$
55

 
$
121