INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
U.S. federal	$ 162	$ 224	$ 3
State and local	12	38	8
Total	174	262	11
Deferred
U.S. federal	225	145	(47)
State and local	24	(4)	(6)
Total	249	141	(53)
U.S. federal	387	369	(44)
State and local	36	34	2
Income tax expense (benefit)	$ 423	$ 403	$ (42)