Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Summary of debt

A summary of our outstanding debt is as follows (amounts in millions):

	At June 30, 2019
	Gross Carrying Amount		Unamortized Discount and Deferred Financing Costs			Net Carrying Amount
2021 Notes	$	650	$	(3	)	$	647
2022 Notes	400		(3		)	397
2026 Notes	850		(8		)	842
2027 Notes	400		(4		)	396
2047 Notes	400		(9		)	391
Total long-term debt	$	2,700	$	(27	)	$	2,673

	At December 31, 2018
	Gross Carrying Amount		Unamortized Discount and Deferred Financing Costs			Net Carrying Amount
2021 Notes	$	650	$	(3	)	$	647
2022 Notes	400		(3		)	397
2026 Notes	850		(8		)	842
2027 Notes	400		(5		)	395
2047 Notes	400		(10		)	390
Total long-term debt	$	2,700	$	(29	)	$	2,671

Schedule of maturities of debt

As of June 30, 2019, 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,
2019 (remaining six months)	$	—
2020	—
2021	650
2022	400
2023	—
Thereafter	1,650
Total	$	2,700