INCOME TAXES - COMPONENTS OF TAX EXPENSE (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax expense (benefit):
Federal	$ 83	$ 0	$ 7
State	11	4	3
Total current	94	4	10
Deferred tax expense:
Federal	94	135	132
State	10	10	13
Total deferred	104	145	145
Total tax expense related to income	$ 198	$ 149	$ 155