RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ (372)	$ (648)
Other comprehensive income before reclassifications			149	264
Other-than-temporary impairment not recognized in earnings on securities	$ (8)	$ (1)	(26)	(22)
Amounts reclassified from other comprehensive (loss) income			(10)	(29)
Net other comprehensive (loss) income			113	213
Ending balance	(259)	(435)	(259)	(435)
Net Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(69)	(298)
Other comprehensive income before reclassifications			108	137
Other-than-temporary impairment not recognized in earnings on securities			0	0
Amounts reclassified from other comprehensive (loss) income			(8)	16
Net other comprehensive (loss) income			100	153
Ending balance	31	(145)	31	(145)
Net Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			74	(91)
Other comprehensive income before reclassifications			41	127
Other-than-temporary impairment not recognized in earnings on securities			(26)	(22)
Amounts reclassified from other comprehensive (loss) income			(9)	(13)
Net other comprehensive (loss) income			6	92
Ending balance	80	1	80	1
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(377)	(259)
Other comprehensive income before reclassifications			0	0
Other-than-temporary impairment not recognized in earnings on securities			0	0
Amounts reclassified from other comprehensive (loss) income			7	(32)
Net other comprehensive (loss) income			7	(32)
Ending balance	$ (370)	$ (291)	$ (370)	$ (291)