Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt consists of the following (in millions):

	As of December 31,
	2020		2019
Series C senior notes, with a rate of 4¾% due March 2023	$	—	$	447
Series D senior notes, with a rate of 3¾% due October 2023		399		398
Series E senior notes, with a rate of 4% due June 2025		497		497
Series F senior notes, with a rate of 4½% due February 2026		397		397
Series G senior notes, with a rate of 3⅞% due April 2024		398		397
Series H senior notes, with a rate of 3⅜% due December 2029		640		640
Series I senior notes, with a rate of 3½% due September 2030		734	—
Total senior notes		3,065		2,776
Credit facility revolver⁽¹⁾		1,474		(8	)
Credit facility term loan due January 2024		498		498
Credit facility term loan due January 2025		499		499
Other debt, with an average interest rate of 8.8% and 5.6% at December 31, 2020 and 2019, respectively, maturing through February 2024		5		29
Total debt	$	5,541	$	3,794

_________

(1)	There were no outstanding credit facility borrowings at December 31, 2019. Amount shown at December 31, 2019 represents deferred financing costs related to the credit facility revolver.

Aggregate debt maturities are as follows (in millions):

The following is a reconciliation between interest expense and cash interest paid (in millions):

	Year ended December 31,
	2020 ⁽²⁾			2019			2018
Interest expense	$	194		$	222		$	176
Amortization of debt premiums/discounts, net		(2	)		(1	)		(1	)
Amortization of deferred financing costs		(6	)		(5	)		(6	)
Non-cash losses on debt extinguishment		(1	)		(6	)		—
Change in accrued interest		(2	)		9			2
Interest paid ⁽¹⁾	$	183		$	219		$	171
___________

(1)	Does not include capitalized interest of $5 million, $4 million and $3 million for 2020, 2019 and 2018, respectively.

(2)	Interest expense and interest paid includes cash prepayment premiums of approximately $35 million and $50 million in 2020 and 2019, respectively.