SHARE-BASED COMPENSATION - Stock Appreciation Rights Activity (Details) (Stock appreciation rights, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Stock appreciation rights
Rights
Balance, beginning of year	1,578
Granted	52
Exercised	(235)
Forfeited or expired	(244)
Balance, end of year	1,151
Exercisable, end of year	926
Weighted Average Exercise Price
Balance, beginning of year	$ 22.80
Granted	$ 20.42
Exercised	$ 19.07
Forfeited or expired	$ 26.45
Balance, end of year	$ 22.67
Exercisable, end of year	$ 24.18
Average Remaining Contractual Term
Balance, end of year	4 years 234 days
Exercisable, end of year	3.94
Aggregate Intrinsic Value
Balance, end of year	$ 6
Exercisable, end of year	$ 4