CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (52)	$ 117	$ (156)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	15	16	23
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(7)	(29)	33
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	$ (168)	$ (49)	(52)
Maximum [Member]
Income tax of noncredit portion of OTTI reclassification (into) out of other comprehensive income, net			$ 1