INCOME TAXES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Income tax settlements	Jun. 30, 2012 Income tax settlements
Estimated annual effective tax rate applicable to our Taxable REIT Subsidiary, excluding discrete items	55.60%
Income tax credit (charge) that is excluded from the company's effective income tax rate		$ 7	$ (3)