CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Realized (gains) losses on sales of investments	[1]	$ (151)	$ (136)	$ (641)	$ (348)
Income from continuing operations before income taxes		(6,187)	(4,984)	(20,018)	(13,241)
Tax effect		1,881	2,068	6,037	6,120
Income from continuing operations		(4,306)	(2,916)	(13,981)	(7,121)
(Gain) loss reclassified from AOCI
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Income from continuing operations before income taxes		47	154	5	527
Tax effect		(12)	(64)	(6)	(204)
Income from continuing operations		35	90	(1)	323
(Gain) loss reclassified from AOCI | Realized gains (losses) on investment securities
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Realized (gains) losses on sales of investments		(151)	(136)	(641)	(348)
OTTI gross impairment losses		80	91	195	329
Income from continuing operations before income taxes		(71)	(45)	(446)	(19)
Tax effect		26	11	160	4
Income from continuing operations		(45)	(34)	(286)	(15)
(Gain) loss reclassified from AOCI | Cash flow hedges
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Income from continuing operations before income taxes		63	114	260	332
Tax effect		(23)	(44)	(96)	(128)
Income from continuing operations		40	70	164	204
(Gain) loss reclassified from AOCI | Cash flow hedges | Interest rate
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Income from continuing operations before income taxes		28	84	148	218
(Gain) loss reclassified from AOCI | Cash flow hedges | Foreign exchange contracts
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Income from continuing operations before income taxes		35	30	112	114
(Gain) loss reclassified from AOCI | Pension liability adjustments
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Amortization of unrecognized prior service cost (benefit)		(11)	(11)	(32)	(30)
Amortization of unrecognized Net actuarial loss		64	63	211	183
Curtailment/settlement impact		2	33	12	61
Income from continuing operations before income taxes		55	85	191	214
Tax effect		(15)	(31)	(70)	(80)
Income from continuing operations		40	54	121	134
(Gain) loss reclassified from AOCI | Foreign currency translation adjustment
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Income from continuing operations		$ 0	$ 0	$ 0	$ 0

[1] Certain prior-period revenue and expense lines and totals were reclassified to conform to the current period’s presentation. See Note 3 to the Consolidated Financial Statements.