Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt

Debt, net of unamortized discounts, premiums and fair value adjustments

	Principal amount				Carrying amount
	September 30,		December 31,		September 30,		December 31,
	2019		2018		2019		2018
6.50% Senior Notes due November 2020	$	208	$	286	$	209	$	288
6.375% Senior Notes due December 2021		224		328		224		327
5.52% Senior Secured Notes due May 2022		221		282		219		280
3.80% Senior Notes due October 2022		199		411		198		408
0.50% Exchangeable Bonds due January 2023		863		863		862		862
5.375% Senior Secured Notes due May 2023		525		—		517		—
9.00% Senior Notes due July 2023		753		1,250		738		1,221
5.875% Senior Secured Notes due January 2024		667		750		655		735
7.75% Senior Secured Notes due October 2024		450		480		441		469
6.25% Senior Secured Notes due December 2024		469		500		460		489
6.125% Senior Secured Notes due August 2025		534		600		524		588
7.25% Senior Notes due November 2025		750		750		737		736
7.50% Senior Notes due January 2026		750		750		743		742
6.875% Senior Secured Notes due February 2027		550		—		541		—
7.45% Notes due April 2027		88		88		86		86
8.00% Debentures due April 2027		57		57		57		57
7.00% Notes due June 2028		300		300		306		306
Finance lease contract due August 2029		—		511		—		511
7.50% Notes due April 2031		588		588		585		585
6.80% Senior Notes due March 2038		1,000		1,000		991		991
7.35% Senior Notes due December 2041		300		300		297		297
Total debt		9,496		10,094		9,390		9,978
Less debt due within one year
5.52% Senior Secured Notes due May 2022		87		83		86		81
9.00% Senior Notes due July 2023		3		—		3		—
5.875% Senior Secured Notes due January 2024		83		83		79		79
7.75% Senior Secured Notes due October 2024		60		60		58		58
6.25% Senior Secured Notes due December 2024		62		62		60		60
6.125% Senior Secured Notes due August 2025		66		66		63		63
Finance lease contract due August 2029		—		32		—		32
Total debt due within one year		361		386		349		373
Total long-term debt	$	9,135	$	9,708	$	9,041	$	9,605

Scheduled maturities of debt

	Total
Twelve months ending September 30,
2020	$	361
2021		602
2022		669
2023		2,582
2024		609
Thereafter		4,673
Total principal amount of debt		9,496
Total debt-related balances, net		(106)
Total carrying amount of debt	$	9,390

Schedule of tender offers

	Nine months
	ended
	September 30,
	2019
6.50% Senior Notes due November 2020	$	57
6.375% Senior Notes due December 2021		63
3.80% Senior Notes due October 2022		190
9.00% Senior Notes due July 2023		200
Aggregate principal amount retired	$	510
Aggregate cash payment	$	522
Aggregate net loss	$	(18)

Schedule of debt repurchases

	Nine months ended September 30,
		2019		2018
6.50% Senior Notes due November 2020	$	21	$	—
6.375% Senior Notes due December 2021		41		—
3.80% Senior Notes due October 2022		22		95
9.00% Senior Notes due July 2023		297		—
Aggregate principal amount retired	$	381	$	95
Aggregate cash payment	$	395	$	95
Aggregate net loss for the three months ended September 30	$	(12)	$	—
Aggregate net loss for the nine months ended September 30	$	(21)	$	(1)