SHAREHOLDERS' INTEREST - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Class of Stock [Line Items]
Common shares, outstanding		536,425,000	535,976,000	211,359,000	211,289,000
Special dividend, payment date	Sep. 01, 2010
Special dividend paid	$ 5,600,000,000
Regular quarterly dividend	11,000,000	323,000,000	608,000,000	127,000,000
Aggregate amount of cash distributed out of the value of the Special Dividend amount	560,000,000
Special dividend, number of common shares issued	324,000,000	0	324,319,000	0
Stock repurchase program, shares repurchased		(2,290,000)	0	(66,000)
Stock Repurchase Plan 2008
Class of Stock [Line Items]
Stock repurchase program, shares repurchased		1,199,800		66,691
Stock repurchase program, shares repurchased value		20,000,000		2,000,000
Stock Repurchase Plan 2011
Class of Stock [Line Items]
Stock repurchase program, shares repurchased		1,089,824
Stock repurchase program, shares repurchased value		17,000,000
Stock repurchase program, authorized repurchase amount		250,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 233,000,000
Preferred shares
Class of Stock [Line Items]
Preferred shares, outstanding		0	0
Preferred shares, authorized		7,000,000
Preferred shares, par value		$ 1
Preference shares
Class of Stock [Line Items]
Preferred shares, outstanding		0	0
Preferred shares, authorized		40,000,000
Preferred shares, par value		$ 1