CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification out of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)
Realized (gains) losses on sales of investments	$ (307)	[1]	$ (128)	[1]
Income from continuing operations before income taxes	(6,937)		(6,083)
Tax effect	2,120		2,131
Income from continuing operations	(4,817)		(3,952)
(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	(85)		237
Tax effect	29		(86)
Income from continuing operations	(56)		151
(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	(307)		(128)
OTTI gross impairment losses	72		201
Income from continuing operations before income taxes	(235)		73
Tax effect	84		(23)
Income from continuing operations	(151)		50
(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	86		117
Tax effect	(32)		(45)
Income from continuing operations	54		72
(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	46		61
(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	40		56
(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)		(9)
Amortization of unrecognized Net actuarial loss	75		56
Income from continuing operations before income taxes	64		47
Tax effect	(23)		(18)
Income from continuing operations	41		29
(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

[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.