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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Summary of debt
A summary of our outstanding debt is as follows (amounts in millions):

 At June 30, 2020
 Gross Carrying
Amount		Unamortized
Discount and Deferred Financing Costs		Net Carrying
Amount
2021 Notes$650  $(2) $648  
2022 Notes400  (2) 398  
2026 Notes850  (7) 843  
2027 Notes400  (4) 396  
2047 Notes400  (9) 391  
Total long-term debt$2,700  $(24) $2,676  

 At December 31, 2019
 Gross Carrying
Amount		Unamortized
Discount and Deferred Financing Costs		Net Carrying
Amount
2021 Notes$650  $(2) $648  
2022 Notes400  (2) 398  
2026 Notes850  (7) 843  
2027 Notes400  (5) 395  
2047 Notes400  (9) 391  
Total long-term debt$2,700  $(25) $2,675  
Schedule of maturities of debt
As of June 30, 2020, the scheduled maturities and contractual principal repayments of our debt for each of the five succeeding years and thereafter are as follows (amounts in millions):
 
For the years ending December 31, 
2020 (remaining six months)$—  
2021650  
2022400  
2023—  
2024—  
Thereafter 1,650  
Total$2,700