FAIR VALUE - Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at January 1	$ 7	$ 11	$ 32
Realized in earnings	0	0	(1)
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	(3)	0	(20)
Settlements	(3)	(4)	0
Balance at December 31	1	7	11
Private Placements
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at January 1	4	6	24
Realized in earnings	0	0	(1)
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	(3)	0	(17)
Settlements	0	(2)	0
Balance at December 31	1	4	6
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at January 1	3	5	8
Realized in earnings	0	0	0
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	0	0	(3)
Settlements	(3)	(2)	0
Balance at December 31	$ 0	$ 3	$ 5