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Sale of Data Centers and Colocation Business (Tables)
 12 Months Ended
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Sale-leaseback transactions
The failed-sale-leaseback accounting treatment had the following effects on our consolidated results of operations for the years ended December 31, 2018 and 2017:
 
Positive (Negative) Impact to Net Income
 
December 31,
 
2018
 
2017
 
(Dollars in millions)
Increase in revenue
$
74

 
49

Decrease in cost of sales
22

 
15

Increase in loss on sale of business included in selling, general and administrative expense
—

 
(102
)
Increase in depreciation expense (one-time)
—

 
(44
)
Increase in depreciation expense (ongoing)
(69
)
 
(47
)
Increase in interest expense
(55
)
 
(39
)
Decrease in income tax expense
7

 
65

Decrease in net income
$
(21
)
 
(103
)