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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Schedule of adjustments made due to new ASU
Balance Sheet
(Dollars in millions)
Balance at
December 31,
2018
 
Adjustments due
to ASU 2016-02
 
Balance at
January 1,
2019
Assets
 
 
 
 
 
Right-of-use assets, operating leases
$
—

 
$
75

 
$
75

Current liabilities
 
 
 
 


Other current liabilities
—

 
16

 
16

Non-current liabilities
 
 
 
 


Operating lease liabilities - non-current
—

 
57

 
57

Equity
 
 
 
 
 
Accumulated deficit
(181
)
 
—

 
(181
)