Fair Value Measurement - Fair Value Level 3 Rollforward Recurring Basis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
FG VIEs' liabilities with recourse, at fair value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	$ (1,366)		$ (1,940)		$ (1,790)		$ (2,090)
Net income (loss)	7		28		(90)		(135)
Other comprehensive income (loss)	0		0		0		0
Purchases	0		0		0		0
Settlements	33		84		332		274
FG VIE consolidations	0		0		(25)		(12)
FG VIE deconsolidations	0		0		247		135
Fair value at end of period	(1,326)		(1,828)		(1,326)		(1,828)
Change in unrealized gains/(losses) related to financial instruments held	6		24		(46)		(141)
FG VIEs' liabilities without recourse, at fair value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	(124)		(1,134)		(1,081)		(1,051)
Net income (loss)	(13)		35		(49)		(157)
Other comprehensive income (loss)	0		0		0		0
Purchases	0		0		0		0
Settlements	4		36		16		135
FG VIE consolidations	0		0		(21)		(37)
FG VIE deconsolidations	0		16		1,002		63
Fair value at end of period	(133)		(1,047)		(133)		(1,047)
Change in unrealized gains/(losses) related to financial instruments held	(5)		(20)		(10)		(246)
Credit Derivative, Asset, Liability Net
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value at beginning of period	(1,837)	[1]	(2,248)	[1]	(1,693)	[1]	(1,793)	[1]
Net income (loss)	255	[1],[2],[3]	354	[1],[2],[3]	147	[1],[2],[3]	(164)	[1],[2],[3]
Other comprehensive income (loss)	0	[1],[2]	0	[1],[2]	0	[1],[2]	0	[1],[2]
Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Settlements	14	[1]	(27)	[1]	(22)	[1]	36	[1]
FG VIE consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	(1,568)	[1]	(1,921)	[1]	(1,568)	[1]	(1,921)	[1]
Change in unrealized gains/(losses) related to financial instruments held	98	[1]	331	[1]	(47)	[1]	14	[1]
Obligations of state and political subdivisions
Fair Value Level 3 Rollforward
Fair value at beginning of period	38		36		36		35
Net Income (loss)	1	[2],[4]	0	[2],[4]	3	[2],[4]	1	[2],[4]
Other comprehensive income (loss)	(1)	[2]	6	[2]	0	[2]	7	[2]
Purchases	0		0		0		0
Settlements	0		(1)		(1)		(2)
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	38		41		38		41
Change in unrealized gains/(losses) related to financial instruments held	(1)		5		0		7
Corporate securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	106		0		136		0
Net Income (loss)	(14)	[2],[4]	1	[2],[4]	(18)	[2],[4]	1	[2],[4]
Other comprehensive income (loss)	5	[2]	4	[2]	(16)	[2]	4	[2]
Purchases	0		130		0		130
Settlements	0		(3)		(5)		(3)
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	97		132		97		132
Change in unrealized gains/(losses) related to financial instruments held	5		4		(16)		4
RMBS
Fair Value Level 3 Rollforward
Fair value at beginning of period	350		276		290		219
Net Income (loss)	6	[2],[4]	4	[2],[4]	16	[2],[4]	15	[2],[4]
Other comprehensive income (loss)	12	[2]	12	[2]	26	[2]	16	[2]
Purchases	159		9		212		79
Settlements	(15)		(14)		(45)		(42)
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		13		0
Fair value at end of period	512		287		512		287
Change in unrealized gains/(losses) related to financial instruments held	12		12		25		16
Asset-backed securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	254		300		268		306
Net Income (loss)	3	[2],[4]	6	[2],[4]	13	[2],[4]	15	[2],[4]
Other comprehensive income (loss)	9	[2]	(2)	[2]	17	[2]	(24)	[2]
Purchases	0		38		0		49
Settlements	0		(2)		(32)		(6)
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	266		340		266		340
Change in unrealized gains/(losses) related to financial instruments held	9		(2)		16		(23)
Other invested assets
Fair Value Level 3 Rollforward
Fair value at beginning of period	49		2		2		1
Net Income (loss)	0	[2],[4]	0	[2],[4]	0	[2],[4]	(1)	[2],[4]
Other comprehensive income (loss)	2	[2]	0	[2]	4	[2]	2	[2]
Purchases	25		0		70		0
Settlements	0		(2)		0		(2)
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	76		0		76		0
Change in unrealized gains/(losses) related to financial instruments held	2		0		4		2
FG VIEs' assets, at fair value
Fair Value Level 3 Rollforward
Fair value at beginning of period	1,284		2,674		2,565		2,688
Net Income (loss)	43	[2],[4]	(30)	[2],[4]	160	[2],[4]	526	[2],[4]
Other comprehensive income (loss)	0	[2]	0	[2]	0	[2]	0	[2]
Purchases	0		0		0		0
Settlements	(31)		(113)		(346)		(553)
FG VIE Consolidations	0		0		46		48
FG VIE deconsolidations	0		(16)		(1,129)		(194)
Fair value at end of period	1,296		2,515		1,296		2,515
Change in unrealized gains/(losses) related to financial instruments held	55		20		120		450
Other assets
Fair Value Level 3 Rollforward
Fair value at beginning of period	31		23		46		36
Net Income (loss)	4	[2],[4]	9	[2],[4]	(11)	[2],[4]	(4)	[2],[4]
Other comprehensive income (loss)	0	[2]	0	[2]	0	[2]	0	[2]
Purchases	0		0		0		0
Settlements	0		0		0		0
FG VIE Consolidations	0		0		0		0
FG VIE deconsolidations	0		0		0		0
Fair value at end of period	35		32		35		32
Change in unrealized gains/(losses) related to financial instruments held	$ 4		$ 9		$ (11)		$ (4)

[1] Represents net position of credit derivatives. The consolidated balance sheet presents gross assets and liabilities based on net counterparty exposure.

[2] Realized and unrealized gains (losses) from changes in values of Level 3 financial instruments represent gains (losses) from changes in values of those financial instruments only for the periods in which the instruments were classified as Level 3.

[3] Reported in net change in fair value of credit derivatives.

[4] Included in net realized investment gains (losses) and net investment income.