FAIR VALUE - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers between Level 1 and Level 2	$ 0	$ 0	$ 0	$ 0
Level 3 assets fair value	40	52	40	52	40	41	65	66
Upper limit percentage of Level 3 assets to total invested assets	0.50%		0.50%
Long-term debt, carrying value	1,618		1,618			1,659
Long-term debt, fair value	$ 1,867		$ 1,867			$ 1,834