The carrying value of long-term debt outstanding, net of unamortized debt issuance costs, was as follows at September 30, 2016 and December 31, 2015:



	September 30, 2016		December 31, 2015
	(in millions)
Senior notes:
$500 million, 7.20% due June 15, 2018	$	501	$	502
$300 million, 6.30% due August 1, 2018	305		307
$400 million, 2.625% due October 1, 2019	398		398
$600 million, 3.15% due December 1, 2022	595		595
$600 million, 3.85% due October 1, 2024	595		595
$250 million, 8.15% due June 15, 2038	263		263
$400 million, 4.625% due December 1, 2042	396		396
$750 million, 4.95% due October 1, 2044	739		738
Total long-term debt	$	3,792	$	3,794