DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Carrying Value of Long-Term Debt Outstanding

The carrying value of long-term debt outstanding was as follows at December 31, 2017 and 2016:

	2017		2016
	(in millions)
Long-term debt:
Senior notes:
$500 million, 7.20% due June 15, 2018	$	—	$	501
$300 million, 6.30% due August 1, 2018	—		304
$400 million, 2.625% due October 1, 2019	399		398
$400 million, 2.50% due December 15, 2020	397		—
$400 million, 2.90% due December 15, 2022	396		—
$600 million, 3.15% due December 1, 2022	595		595
$600 million, 3.85% due October 1, 2024	595		595
$600 million, 3.95% due March 15, 2027	594		—
$250 million, 8.15% due June 15, 2038	263		264
$400 million, 4.625% due December 1, 2042	396		396
$750 million, 4.95% due October 1, 2044	739		739
$400 million, 4.80% due March 15, 2047	396		—
Total long-term debt	$	4,770	$	3,792