INVESTMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Investments summary
Securities available-for-sale, at fair value	$ 279,877		$ 279,877		$ 288,695
Debt securities held-to-maturity	10,808		10,808		10,130
Non-marketable equity securities carried at fair value	5,435		5,435		5,768
Non-marketable equity securities carried at cost	7,405		7,405		7,733
Total investments	303,525		303,525		312,326
Interest and dividends on investments
Taxable interest	1,389	1,636	4,280	4,900
Interest exempt from U.S. federal income tax	197	168	567	508
Dividends	103.0	78.0	331.0	238.0
Total interest and dividends	1,689	1,882	5,178	5,646
Gross realized investments losses, excluding losses from other-than-temporary impairment
Gross realized investment gains	375	660	1,489	3,155
Gross realized investment losses	(312)	(45)	(725)	(342)
Net realized gains (losses)	63	615	764	2,813
Available-for-sale Securities transferred from Held-to-maturity
Carrying value of held-to-maturity investments sold	235	302	720	1,545
Net realized gain (loss) on sale of held-to-maturity securities	(39)	(4)	(105)	(173)
Carrying value of securities reclassified as available-for-sale		137	902	244
OTTI losses on securities reclassified to available-for-sale		(33)	(155)	(59)
Securities available-for-sale
Fair value	279,877		279,877		288,695
Unrealized gains from impact of minority investments and the related allocations and pick up of unrealized gains and losses of AFS securities	61		61		32
Mortgage-backed securities
Investments summary
Securities available-for-sale, at fair value	54,486		54,486		55,471
Debt securities held-to-maturity	2,685		2,685		4,709
Securities available-for-sale
Amortized cost	54,466		54,466		53,965
Gross unrealized gains	634		634		1,672
Gross unrealized losses	614		614		166
Fair value	54,486		54,486		55,471
U.S. government-sponsored agency guaranteed
Investments summary
Securities available-for-sale, at fair value	43,592		43,592		47,345
Securities available-for-sale
Amortized cost	43,673		43,673		46,001
Gross unrealized gains	521		521		1,507
Gross unrealized losses	602		602		163
Fair value	43,592		43,592		47,345
Prime
Investments summary
Securities available-for-sale, at fair value	27		27		86
Debt securities held-to-maturity	103		103		209
Securities available-for-sale
Amortized cost	27		27		85
Gross unrealized gains					1
Fair value	27		27		86
Alt-A
Investments summary
Securities available-for-sale, at fair value	1		1		1
Debt securities held-to-maturity	1,309		1,309		2,132
Securities available-for-sale
Amortized cost	1		1		1
Fair value	1		1		1
Non-U.S. residential
Investments summary
Securities available-for-sale, at fair value	10,448		10,448		7,590
Debt securities held-to-maturity	1,243		1,243		2,087
Securities available-for-sale
Amortized cost	10,348		10,348		7,442
Gross unrealized gains	105		105		148
Gross unrealized losses	5		5
Fair value	10,448		10,448		7,590
Commercial
Investments summary
Securities available-for-sale, at fair value	418		418		449
Debt securities held-to-maturity	13		13		123
Securities available-for-sale
Amortized cost	417		417		436
Gross unrealized gains	8		8		16
Gross unrealized losses	7		7		3
Fair value	418		418		449
U.S. Treasury and federal agency securities
Investments summary
Securities available-for-sale, at fair value	82,605		82,605		91,841
Securities available-for-sale
Amortized cost	82,063		82,063		90,681
Gross unrealized gains	681		681		1,180
Gross unrealized losses	139		139		20
Fair value	82,605		82,605		91,841
U.S. Treasury
Investments summary
Securities available-for-sale, at fair value	62,455		62,455		65,594
Securities available-for-sale
Amortized cost	61,979		61,979		64,667
Gross unrealized gains	561		561		943
Gross unrealized losses	85		85		16
Fair value	62,455		62,455		65,594
Agency obligations
Investments summary
Securities available-for-sale, at fair value	20,150		20,150		26,247
Securities available-for-sale
Amortized cost	20,084		20,084		26,014
Gross unrealized gains	120		120		237
Gross unrealized losses	54		54		4
Fair value	20,150		20,150		26,247
State and municipal securities
Investments summary
Securities available-for-sale, at fair value	17,997		17,997		18,332
Debt securities held-to-maturity	1,183		1,183		1,205
Securities available-for-sale
Amortized cost	19,944		19,944		20,020
Gross unrealized gains	78		78		132
Gross unrealized losses	2,025		2,025		1,820
Fair value	17,997		17,997		18,332
Foreign government
Investments summary
Securities available-for-sale, at fair value	92,282		92,282		94,047
Debt securities held-to-maturity	5,607		5,607		2,987
Securities available-for-sale
Amortized cost	92,419		92,419		93,298
Gross unrealized gains	454		454		903
Gross unrealized losses	591		591		154
Fair value	92,282		92,282		94,047
Corporate
Investments summary
Securities available-for-sale, at fair value	11,540		11,540		9,674
Debt securities held-to-maturity	753		753		726
Securities available-for-sale
Amortized cost	11,380		11,380		9,302
Gross unrealized gains	266		266		398
Gross unrealized losses	106		106		26
Fair value	11,540		11,540		9,674
Asset-backed securities
Investments summary
Securities available-for-sale, at fair value	16,274		16,274		14,130
Debt securities held-to-maturity	580		580		503
Securities available-for-sale
Amortized cost	16,314		16,314		14,188
Gross unrealized gains	67		67		85
Gross unrealized losses	107		107		143
Fair value	16,274		16,274		14,130
Other debt securities
Investments summary
Securities available-for-sale, at fair value	366		366		258
Securities available-for-sale
Amortized cost	366		366		256
Gross unrealized gains					2
Fair value	366		366		258
Total debt securities AFS
Investments summary
Securities available-for-sale, at fair value	275,550		275,550		283,753
Securities available-for-sale
Amortized cost	276,952		276,952		281,710
Gross unrealized gains	2,180		2,180		4,372
Gross unrealized losses	3,582		3,582		2,329
Fair value	275,550		275,550		283,753
Marketable equity securities AFS
Investments summary
Securities available-for-sale, at fair value	4,327		4,327		4,942
Securities available-for-sale
Amortized cost	4,326		4,326		4,643
Gross unrealized gains	125		125		444
Gross unrealized losses	124		124		145
Fair value	4,327		4,327		4,942
Total securities AFS
Investments summary
Securities available-for-sale, at fair value	279,877		279,877		288,695
Securities available-for-sale
Amortized cost	281,278		281,278		286,353
Gross unrealized gains	2,305		2,305		4,816
Gross unrealized losses	3,706		3,706		2,474
Fair value	$ 279,877		$ 279,877		$ 288,695