PREFERRED STOCK (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended		3 Months Ended		0 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended		0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Mar. 31, 2014 Forecast	Dec. 31, 2013 Forecast	Jan. 25, 2008 Series AA	Sep. 30, 2013 Series AA	Dec. 31, 2012 Series AA	Oct. 29, 2012 Series A	Sep. 30, 2013 Series A	Dec. 31, 2012 Series A	Dec. 13, 2012 Series B	Sep. 30, 2013 Series B	Dec. 31, 2012 Series B	Mar. 26, 2013 Series C	Sep. 30, 2013 Series C	Apr. 30, 2013 Series D	Sep. 30, 2013 Series D	Apr. 28, 2008 Series E	Sep. 30, 2013 Series E	Dec. 31, 2012 Series E	Sep. 19, 2013 Series J	Sep. 30, 2013 Series J	Dec. 31, 2012 Series F	Dec. 31, 2012 Series T	Oct. 31, 2013 Series K Subsequent event
Preferred stock
Dividend rate (as a percent)						8.125%	8.125%		5.95%	5.95%		5.90%	5.90%		5.80%		5.35%		8.40%	8.40%		7.125%	8.50%	6.50%	6.875%
Redemption price per depositary share/ preference share (in dollars per share)						$ 25	$ 25		$ 1,000	$ 1,000		$ 1,000	$ 1,000		$ 25		$ 1,000		$ 1,000	$ 1,000		$ 25	$ 25	$ 50
Number of depositary shares						3,870,330	3,870,330		1,500,000	1,500,000		750,000	750,000		23,000,000		1,250,000		121,254	121,254		38,000,000	2,863,369	453,981
Carrying value	$ 5,243	$ 2,562				$ 97	$ 97		$ 1,500	$ 1,500		$ 750	$ 750		$ 575		$ 1,250		$ 121	$ 121		$ 950	$ 71	$ 23	$ 1,500
Depositary shares interest in shares of preferred stock					0.001			0.04			0.04			0.001		0.04		0.04			0.001				0.001
Distribution of preferred dividends	$ 123		$ 94	$ 71