Gross Unrealized Losses and Fair Value of Investment Securities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Securities		Dec. 31, 2012 Securities
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	$ 14,393		$ 5,612
Gross unrealized losses	(1,006)	[1]	(601)	[2]
Number of securities in a continuous loss position	1,933		983
Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	12,339		2,951
Gross unrealized losses	(641)		(54)
Number of securities in a continuous loss position	1,624		425
12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	2,054		2,661
Gross unrealized losses	(365)	[1]	(547)	[3]
Number of securities in a continuous loss position	309		558
Investment grade
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	13,527		4,377
Gross unrealized losses	(931)	[1]	(252)	[2]
Number of securities in a continuous loss position	1,723		591
Investment grade | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	11,896		2,761
Gross unrealized losses	(616)		(43)
Number of securities in a continuous loss position	1,515		356
Investment grade | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,631		1,616
Gross unrealized losses	(315)	[1]	(209)	[3]
Number of securities in a continuous loss position	208		235
Below investment grade
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	866	[4]	1,235	[5]
Gross unrealized losses	(75)	[1],[4]	(349)	[2],[5]
Number of securities in a continuous loss position	210	[4]	392	[5]
Below investment grade | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	443	[4]	190	[5]
Gross unrealized losses	(25)	[4]	(11)	[5]
Number of securities in a continuous loss position	109	[4]	69	[5]
Below investment grade | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	423	[4]	1,045	[5]
Gross unrealized losses	(50)	[1],[4]	(338)	[3],[5]
Number of securities in a continuous loss position	101	[4]	323	[5]
Fixed maturity securities
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	14,298		5,546
Gross unrealized losses	(993)	[1]	(595)	[2]
Number of securities in a continuous loss position	1,892		938
Fixed maturity securities | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	12,244		2,899
Gross unrealized losses	(628)		(50)
Number of securities in a continuous loss position	1,583		393
Fixed maturity securities | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	2,054		2,647
Gross unrealized losses	(365)	[1]	(545)	[3]
Number of securities in a continuous loss position	309		545
Fixed maturity securities | Less Than 20 Percent Below Cost
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	13,584		5,050
Gross unrealized losses	(710)	[1]	(244)	[2]
Number of securities in a continuous loss position	1,809		730
Fixed maturity securities | Less Than 20 Percent Below Cost | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	12,009		2,899
Gross unrealized losses	(547)		(50)
Number of securities in a continuous loss position	1,571		393
Fixed maturity securities | Less Than 20 Percent Below Cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,575		2,151
Gross unrealized losses	(163)	[1]	(194)	[3]
Number of securities in a continuous loss position	238		337
Fixed maturity securities | 20 To 50 percent below cost
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	701		445
Gross unrealized losses	(268)	[1]	(218)	[2]
Number of securities in a continuous loss position	63		128
Fixed maturity securities | 20 To 50 percent below cost | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	235		0
Gross unrealized losses	(81)		0
Number of securities in a continuous loss position	12		0
Fixed maturity securities | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	466		445
Gross unrealized losses	(187)	[1]	(218)	[3]
Number of securities in a continuous loss position	51		128
Fixed maturity securities | Greater than 50% below cost
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	13		51
Gross unrealized losses	(15)	[1]	(133)	[2]
Number of securities in a continuous loss position	20		80
Fixed maturity securities | Greater than 50% below cost | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0		0
Gross unrealized losses	0		0
Number of securities in a continuous loss position	0		0
Fixed maturity securities | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	13		51
Gross unrealized losses	(15)	[1]	(133)	[3]
Number of securities in a continuous loss position	20		80
Fixed maturity securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	447
Gross unrealized losses	(180)
Number of securities in a continuous loss position	33
Percentage of total gross unrealized losses for securities in a continuous loss position	19.00%
Fixed maturity securities | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	3
Gross unrealized losses	(3)
Number of securities in a continuous loss position	6
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	19
Gross unrealized losses	(7)
Number of securities in a continuous loss position	18
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Below investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	10
Gross unrealized losses	(12)
Number of securities in a continuous loss position	14
Percentage of total gross unrealized losses for securities in a continuous loss position	1.00%
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,131		655
Gross unrealized losses	(231)	[1]	(18)	[2]
Number of securities in a continuous loss position	45		19
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	796		655
Gross unrealized losses	(109)		(18)
Number of securities in a continuous loss position	32		19
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	335		0
Gross unrealized losses	(122)	[1]	0	[3]
Number of securities in a continuous loss position	13		0
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	264
Gross unrealized losses	(106)
Number of securities in a continuous loss position	10
Percentage of total gross unrealized losses for securities in a continuous loss position	11.00%
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Tax-exempt
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	179		137
Gross unrealized losses	(36)	[1]	(30)	[2]
Number of securities in a continuous loss position	35		13
Fixed maturity securities | Tax-exempt | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	82		0
Gross unrealized losses	(3)		0
Number of securities in a continuous loss position	26		0
Fixed maturity securities | Tax-exempt | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	97		137
Gross unrealized losses	(33)	[1]	(30)	[3]
Number of securities in a continuous loss position	9		13
Fixed maturity securities | Tax-exempt | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	67
Gross unrealized losses	(26)
Number of securities in a continuous loss position	7
Percentage of total gross unrealized losses for securities in a continuous loss position	3.00%
Fixed maturity securities | Tax-exempt | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Government - non-U.S.
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	479		103
Gross unrealized losses	(15)	[1]	(1)	[2]
Number of securities in a continuous loss position	60		21
Fixed maturity securities | Government - non-U.S. | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	479		103
Gross unrealized losses	(15)		(1)
Number of securities in a continuous loss position	60		21
Fixed maturity securities | Government - non-U.S. | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0		0
Gross unrealized losses	0	[1]	0	[3]
Number of securities in a continuous loss position	0		0
Fixed maturity securities | U.S. corporate
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	5,437		1,505
Gross unrealized losses	(359)	[1]	(104)	[2]
Number of securities in a continuous loss position	789		219
Fixed maturity securities | U.S. corporate | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	4,774		859
Gross unrealized losses	(260)		(19)
Number of securities in a continuous loss position	707		154
Fixed maturity securities | U.S. corporate | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	663		646
Gross unrealized losses	(99)	[1]	(85)	[3]
Number of securities in a continuous loss position	82		65
Fixed maturity securities | U.S. corporate | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	30
Gross unrealized losses	(9)
Number of securities in a continuous loss position	3
Percentage of total gross unrealized losses for securities in a continuous loss position	1.00%
Fixed maturity securities | U.S. corporate | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Corporate - non-U.S.
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	3,292		1,101
Gross unrealized losses	(156)	[1]	(47)	[2]
Number of securities in a continuous loss position	413		146
Fixed maturity securities | Corporate - non-U.S. | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	3,005		665
Gross unrealized losses	(127)		(9)
Number of securities in a continuous loss position	379		105
Fixed maturity securities | Corporate - non-U.S. | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	287		436
Gross unrealized losses	(29)	[1]	(38)	[3]
Number of securities in a continuous loss position	34		41
Fixed maturity securities | Corporate - non-U.S. | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	20
Gross unrealized losses	(7)
Number of securities in a continuous loss position	4
Percentage of total gross unrealized losses for securities in a continuous loss position	1.00%
Fixed maturity securities | Corporate - non-U.S. | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Fixed maturity securities | Residential mortgage-backed
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,209		646
Gross unrealized losses	(74)	[1]	(225)	[2]
Number of securities in a continuous loss position	231		310
Fixed maturity securities | Residential mortgage-backed | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,052		152
Gross unrealized losses	(55)		(1)
Number of securities in a continuous loss position	139		32
Fixed maturity securities | Residential mortgage-backed | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	157		494
Gross unrealized losses	(19)	[1]	(224)	[3]
Number of securities in a continuous loss position	92		278
Fixed maturity securities | Commercial mortgage-backed
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,337		932
Gross unrealized losses	(65)	[1]	(103)	[2]
Number of securities in a continuous loss position	169		150
Fixed maturity securities | Commercial mortgage-backed | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	967		183
Gross unrealized losses	(42)		(1)
Number of securities in a continuous loss position	107		20
Fixed maturity securities | Commercial mortgage-backed | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	370		749
Gross unrealized losses	(23)	[1]	(102)	[3]
Number of securities in a continuous loss position	62		130
Fixed maturity securities | Other asset-backed
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,234		467
Gross unrealized losses	(57)	[1]	(67)	[2]
Number of securities in a continuous loss position	150		60
Fixed maturity securities | Other asset-backed | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1,089		282
Gross unrealized losses	(17)		(1)
Number of securities in a continuous loss position	133		42
Fixed maturity securities | Other asset-backed | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	145		185
Gross unrealized losses	(40)	[1]	(66)	[3]
Number of securities in a continuous loss position	17		18
Equity securities
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	95		66
Gross unrealized losses	(13)	[1]	(6)	[2]
Number of securities in a continuous loss position	41		45
Equity securities | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	95		52
Gross unrealized losses	(13)		(4)
Number of securities in a continuous loss position	41		32
Equity securities | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0		14
Gross unrealized losses	0	[1]	(2)	[3]
Number of securities in a continuous loss position	0		13
Equity securities | Less Than 20 Percent Below Cost
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	87		59
Gross unrealized losses	(11)	[1]	(3)	[2]
Number of securities in a continuous loss position	40		40
Equity securities | Less Than 20 Percent Below Cost | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	87		47
Gross unrealized losses	(11)		(2)
Number of securities in a continuous loss position	40		29
Equity securities | Less Than 20 Percent Below Cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0		12
Gross unrealized losses	0	[1]	(1)	[3]
Number of securities in a continuous loss position	0		11
Equity securities | 20 To 50 percent below cost
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	8		7
Gross unrealized losses	(2)	[1]	(3)	[2]
Number of securities in a continuous loss position	1		5
Equity securities | 20 To 50 percent below cost | Less Than Twelve Months
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	8		5
Gross unrealized losses	(2)		(2)
Number of securities in a continuous loss position	1		3
Equity securities | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0		2
Gross unrealized losses	0	[1]	(1)	[3]
Number of securities in a continuous loss position	0		2
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	50
Gross unrealized losses	(16)
Number of securities in a continuous loss position	7
Percentage of total gross unrealized losses for securities in a continuous loss position	2.00%
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More | Finance and insurance
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	39
Gross unrealized losses	(13)
Number of securities in a continuous loss position	5
Percentage of total gross unrealized losses for securities in a continuous loss position	2.00%
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More | Utilities and energy
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	4
Gross unrealized losses	(1)
Number of securities in a continuous loss position	1
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More | Industrial
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	7
Gross unrealized losses	(2)
Number of securities in a continuous loss position	1
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More | Finance and insurance
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More | Utilities and energy
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More | Industrial
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	66
Gross unrealized losses	(32)
Number of securities in a continuous loss position	9
Percentage of total gross unrealized losses for securities in a continuous loss position	3.00%
Structured Securities | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	3
Gross unrealized losses	(3)
Number of securities in a continuous loss position	6
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	19
Gross unrealized losses	(7)
Number of securities in a continuous loss position	18
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Below investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	10
Gross unrealized losses	(12)
Number of securities in a continuous loss position	14
Percentage of total gross unrealized losses for securities in a continuous loss position	1.00%
Structured Securities | Residential mortgage-backed | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	6
Gross unrealized losses	(3)
Number of securities in a continuous loss position	4
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Residential mortgage-backed | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	3
Gross unrealized losses	(3)
Number of securities in a continuous loss position	6
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Residential mortgage-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	4
Gross unrealized losses	(2)
Number of securities in a continuous loss position	13
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Residential mortgage-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	2
Gross unrealized losses	(4)
Number of securities in a continuous loss position	12
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Commercial mortgage-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	15
Gross unrealized losses	(5)
Number of securities in a continuous loss position	5
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Commercial mortgage-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	1
Gross unrealized losses	(1)
Number of securities in a continuous loss position	1
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Other asset-backed | Investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	60
Gross unrealized losses	(29)
Number of securities in a continuous loss position	5
Percentage of total gross unrealized losses for securities in a continuous loss position	3.00%
Structured Securities | Other asset-backed | Investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Other asset-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	0
Gross unrealized losses	0
Number of securities in a continuous loss position	0
Percentage of total gross unrealized losses for securities in a continuous loss position	0.00%
Structured Securities | Other asset-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]
Fair value	7
Gross unrealized losses	$ (7)
Number of securities in a continuous loss position	1
Percentage of total gross unrealized losses for securities in a continuous loss position	1.00%

[1] Amounts included $7 million of unrealized losses on other-than-temporarily impaired securities.

[2] Amounts included $124 million of unrealized losses on other-than-temporarily impaired securities.

[3] Amounts included $123 million of unrealized losses on other-than-temporarily impaired securities.

[4] Amounts that have been in a continuous loss position for 12 months or more included $7 million of unrealized losses on other-than-temporarily impaired securities.

[5] Amounts that have been in a continuous loss position for 12 months or more included $119 million of unrealized losses on other-than-temporarily impaired securities.