Fair Value Measurement - Change in Level 3 Fair Value Measurements (Details) (Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Obligations of state and political subdivisions
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	$ 35		$ 10
Net Income (loss)	(8)	[1],[2]	1	[1],[2]
Other comprehensive income (loss)	13	[1]	(10)	[1]
Purchases	0		34
Settlements	(4)		0
Balance at the end of the period	36		35
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	14		(10)
RMBS
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	219		134
Net Income (loss)	13	[1],[2]	11	[1],[2]
Other comprehensive income (loss)	26	[1]	16	[1]
Purchases	86		108
Settlements	(54)		(50)
Balance at the end of the period	290		219
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	27		11
Asset-backed securities
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	306		235
Net Income (loss)	67	[1],[2]	29	[1],[2]
Other comprehensive income (loss)	(43)	[1]	30	[1]
Purchases	80		40
Settlements	(142)		(28)
Balance at the end of the period	268		306
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	(20)		33
Corporate securities
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	0
Net Income (loss)	4	[1],[2]
Other comprehensive income (loss)	5	[1]
Purchases	130	[3]
Settlements	(3)
Balance at the end of the period	136
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	5
Other invested assets
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	1		2
Net Income (loss)	(1)	[1],[4]	0	[1],[4]
Other comprehensive income (loss)	2	[1]	(1)	[1]
Purchases	2		0
Settlements	(2)		0
Balance at the end of the period	2		1
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	2		(1)
FG VIEs' assets, at fair value
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	2,688		2,819
Net Income (loss)	686	[1],[5]	399	[1],[5]
Other comprehensive income (loss)	0	[1]	0	[1]
Purchases	0		0
Settlements	(663)		(545)
FG VIE consolidations	48		15
FG VIE deconsolidations	(194)
FG VIE elimination			0
Balance at the end of the period	2,565		2,688
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	623		674
Other assets
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	36		54
Net Income (loss)	10	[1],[6]	(18)	[1],[6]
Other comprehensive income (loss)	0	[1]	0	[1]
Purchases	0		0
Settlements	0		0
Balance at the end of the period	46		36
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	10		(18)	[7]
Credit Derivative, Asset, Liability Net
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	(1,793)	[7]	(1,304)	[7]
Net Income (loss)	65	[1],[7],[8]	(585)	[1],[7],[8]
Other comprehensive income (loss)	0	[1],[7]	0	[1],[7]
Purchases	0	[7]	0	[7]
Settlements	35	[7]	96	[7]
Balance at the end of the period	(1,693)	[7]	(1,793)	[7]
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	(139)	[7]	(480)	[7]
FG VIEs' liabilities with recourse, at fair value
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	(2,090)		(2,397)
Net Income (loss)	(166)	[1],[5]	(276)	[1],[5]
Other comprehensive income (loss)	0	[1]	0	[1]
Purchases	0		0
Settlements	343		519
FG VIE consolidations	(12)		(18)
FG VIE deconsolidations	135
FG VIE elimination			82
Balance at the end of the period	(1,790)		(2,090)
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	(169)		(608)
FG VIEs' liabilities without recourse, at fair value
Total pretax realized and unrealized gains/(losses) recorded in
Balance at the beginning of the period	(1,051)		(1,061)
Net Income (loss)	(225)	[1],[5]	(195)	[1],[5]
Other comprehensive income (loss)	0	[1]	0	[1]
Purchases	0		0
Settlements	168		205
FG VIE consolidations	(37)		0
FG VIE deconsolidations	64
FG VIE elimination			0
Balance at the end of the period	(1,081)		(1,051)
Total pre-tax realized/unrealized gains/(losses) recorded in
Change in unrealized gains/(losses) related to financial instruments held at the reporting date	$ (326)		$ 50

[1] 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.

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

[3] Non cash transaction.

[4] Reported in other income.

[5] Included in fair value gains (losses) on FG VIEs.

[6] Recorded in fair value gains (losses) on CCS.

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

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