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Investments (Available For Sale In Consolidated Investment Portfolio) (Details) (USD $)
In Millions

Sep. 30, 2011

Dec. 31, 2010

Variable Interest Entity [Line Items]

$ 10,754

$ 12,822

Gross Unrealized Gains

375

220

Gross Unrealized Losses

(567)

(804)

10,562

12,238

Other-Than-Temporary Impairments

(197)

^[1]

(241)

^[1]

Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member]

Variable Interest Entity [Line Items]

185

91

Gross Unrealized Losses

(14)

(1)

171

90

Variable Interest Entity, Primary Beneficiary [Member] | Fixed-Maturity Investments [Member]

Variable Interest Entity [Line Items]

356

314

Variable Interest Entity, Primary Beneficiary [Member] | Fixed-Maturity Investments [Member] | Mortgage-Backed Securities [Member]

Variable Interest Entity [Line Items]

124

96

Variable Interest Entity, Primary Beneficiary [Member] | Fixed-Maturity Investments [Member] | Asset-Backed Securities [Member]

Variable Interest Entity [Line Items]

230

216

Variable Interest Entity, Primary Beneficiary [Member] | Other Long Term Investments [Member] | Money Market Securities [Member]

Variable Interest Entity [Line Items]

218

149

218

149

Variable Interest Entity, Primary Beneficiary [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member]

Variable Interest Entity [Line Items]

124

Gross Unrealized Losses

(28)

96

Variable Interest Entity, Primary Beneficiary [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member]

Variable Interest Entity [Line Items]

45

98

Gross Unrealized Gains

2

45

100

Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member]

Variable Interest Entity [Line Items]

2

2

Residential Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member]

Variable Interest Entity [Line Items]

1,322

1,537

Gross Unrealized Gains

56

39

Gross Unrealized Losses

(13)

1,378

1,563

Commercial Mortgage-Backed [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member]

Variable Interest Entity [Line Items]

63

199

Gross Unrealized Gains

1

24

Gross Unrealized Losses

(8)

(19)

56

204

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member]

Variable Interest Entity [Line Items]

387

627

Gross Unrealized Gains

44

36

Gross Unrealized Losses

(85)

(180)

346

483

Other-Than-Temporary Impairments

(127)

^[1]

(155)

^[1]

Fixed-Maturity Investments [Member] | Mortgage-Backed Securities [Member]

Variable Interest Entity [Line Items]

1,772

1,780

Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member]

Variable Interest Entity [Line Items]

271

472

Gross Unrealized Gains

1

Gross Unrealized Losses

(123)

(180)

148

293

Other-Than-Temporary Impairments

(70)

^[1]

(86)

^[1]

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member]

Variable Interest Entity [Line Items]

595

732

Gross Unrealized Gains

2

1

Gross Unrealized Losses

(148)

(112)

449

621

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] | State And Municipal Bonds [Member]

Variable Interest Entity [Line Items]

804

Gross Unrealized Gains

55

Gross Unrealized Losses

(11)

848

Fixed-Maturity Investments [Member] | Asset-Backed Securities [Member]

Variable Interest Entity [Line Items]

866

597

Fixed-Maturity Investments [Member] | Taxable Bonds [Member]

Variable Interest Entity [Line Items]

6,516

8,792

Gross Unrealized Gains

293

188

Gross Unrealized Losses

(484)

(687)

6,325

8,293

Other-Than-Temporary Impairments

(197)

^[1]

(241)

^[1]

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | U.S. Treasury And Government Agency [Member]

Variable Interest Entity [Line Items]

825

1,055

Gross Unrealized Gains

59

12

Gross Unrealized Losses

(3)

884

1,064

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Foreign Governments [Member]

Variable Interest Entity [Line Items]

354

451

Gross Unrealized Gains

22

19

Gross Unrealized Losses

(1)

376

469

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Corporate Obligations [Member]

Variable Interest Entity [Line Items]

1,895

2,922

Gross Unrealized Gains

54

49

Gross Unrealized Losses

(109)

(127)

1,840

2,844

Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | State And Municipal Bonds [Member]

Variable Interest Entity [Line Items]

797

Gross Unrealized Gains

7

Gross Unrealized Losses

(52)

752

Fixed-Maturity Investments [Member] | State And Municipal Bonds [Member] | Tax-Exempt Bonds [Member]

Variable Interest Entity [Line Items]

2,771

2,907

Gross Unrealized Gains

80

19

Gross Unrealized Losses

(10)

(104)

2,841

2,822

Fixed-Maturity Investments [Member] | Tax-Exempt Bonds [Member]

Variable Interest Entity [Line Items]

2,771

2,907

Gross Unrealized Gains

80

19

Gross Unrealized Losses

(10)

(104)

2,841

2,822

Other Long Term Investments [Member] | Perpetual Preferred Securities [Member]

Variable Interest Entity [Line Items]

178

195

Gross Unrealized Gains

8

Gross Unrealized Losses

(31)

(12)

147

191

Other Long Term Investments [Member]

Variable Interest Entity [Line Items]

893

785

Gross Unrealized Gains

2

11

Gross Unrealized Losses

(31)

(12)

864

784

Other Long Term Investments [Member] | Other Long Term Investments [Member]

Variable Interest Entity [Line Items]

26

38

Gross Unrealized Gains

2

3

28

41

Other Long Term Investments [Member] | Money Market Securities [Member]

Variable Interest Entity [Line Items]

689

552

689

552

Fixed-Maturity Investments [Member]

Variable Interest Entity [Line Items]

9,287

11,699

Gross Unrealized Gains

373

207

Gross Unrealized Losses

(494)

(791)

9,166

11,115

Other-Than-Temporary Impairments

$ (197)

^[1]

$ (241)

^[1]

[1]	- Represents the amount of other-than-temporary losses recognized in accumulated other comprehensive income (loss) since the adoption of the accounting guidance for other-than-temporary impairments.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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