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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Summary of debt
A summary of our outstanding debt is as follows (amounts in millions):
 
At December 31, 2017
 
Gross Carrying
Amount
 
Unamortized
Discount and Deferred Financing Costs
 
Net Carrying
Amount
2017 TLA
$
990

 
$
(8
)
 
$
982

2021 Notes
650

 
(4
)
 
646

2022 Notes
400

 
(4
)
 
396

2023 Notes
750

 
(9
)
 
741

2026 Notes
850

 
(9
)
 
841

2027 Notes
400

 
(6
)
 
394

2047 Notes
400

 
(10
)
 
390

Total long-term debt
$
4,440

 
$
(50
)
 
$
4,390

 
At December 31, 2016
 
Gross Carrying
Amount
 
Unamortized
Discount and Deferred Financing Costs
 
Net Carrying
Amount
2016 TLA
$
2,690

 
$
(27
)
 
$
2,663

2021 Notes
650

 
(5
)
 
645

2023 Notes
750

 
(11
)
 
739

2026 Notes
850

 
(10
)
 
840

Total long-term debt
$
4,940

 
$
(53
)
 
$
4,887
Schedule of maturities of debt
As of December 31, 2017 the scheduled maturities and contractual principal repayments of our debt for each of the five succeeding years are as follows (amounts in millions):
For the year ending December 31,
 

2018
$
—

2019
—

2020
—

2021
1,640

2022
400

Thereafter
2,400

Total
$
4,440