CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 865	$ (3,426)	$ 643
Other comprehensive income (loss):
Net unrealized derivative instrument gains (losses) arising during the periods, net of income taxes of $122, ($100) and ($15), respectively	212	(172)	(26)
Reclassification adjustment for net derivative losses included in net income, net of income taxes of $10, $66 and $123, respectively	17	114	212
Net unrealized securities gains (losses) arising during the periods, net of income taxes of $116, ($165) and $80, respectively	198	(285)	138
Other-than-temporary impairment not recognized in earnings on securities, net of income taxes of ($13), ($15) and ($22), respectively	(22)	(26)	(38)
Reclassification of net securities gains to net income, net of income taxes of ($7), ($50) and ($26), respectively	(11)	(86)	(45)
Defined benefit pension plans:
Actuarial (loss) gain, net of income taxes of ($92), $66 and ($63), respectively	(148)	110	(107)
Net prior service credit, net of income taxes of $3, $0 and $0, respectively	4	0	0
Amortization of actuarial gain, net of income taxes $3, $5 and $14, respectively	7	9	24
Amortization of net prior service credit, net of income taxes $0, $0 and $0, respectively	(1)	0	0
Divestitures to parent effective September 1, 2014, net of income taxes of $12, $0 and $0, respectively	20	0	0
Settlement, net of income taxes of $0, $0 and $34, respectively	0	0	58
Total other comprehensive income (loss), net of income taxes	276	(336)	216
Total comprehensive income (loss)	$ 1,141	$ (3,762)	$ 859