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Investments (Available for Sale in the Consolidated Investment Portfolio) (Details) (USD $)
In Millions

Jun. 30, 2011

Dec. 31, 2010

$ 11,249

$ 12,822

Gross Unrealized Gains

229

220

Gross Unrealized Losses

(532)

(804)

10,946

12,238

Other-Than-Temporary Impairments

(185)

(241)

^[1]

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

82

91

Gross Unrealized Gains

1

Gross Unrealized Losses

(1)

(1)

82

90

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

134

135

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

134

135

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

52

98

Gross Unrealized Gains

1

2

53

100

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

145

149

145

149

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

1,363

1,537

Gross Unrealized Gains

43

39

Gross Unrealized Losses

(5)

(13)

1,401

1,563

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

87

199

Gross Unrealized Gains

1

24

Gross Unrealized Losses

(7)

(19)

81

204

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

552

627

Gross Unrealized Gains

54

36

Gross Unrealized Losses

(114)

(180)

492

483

Other-Than-Temporary Impairments

(136)

(155)

^[1]

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

2,002

1,974

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

413

472

Gross Unrealized Gains

1

Gross Unrealized Losses

(130)

(180)

283

293

Other-Than-Temporary Impairments

(49)

(86)

^[1]

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

7,374

8,792

Gross Unrealized Gains

200

188

Gross Unrealized Losses

(483)

(687)

7,091

8,293

Other-Than-Temporary Impairments

(185)

(241)

^[1]

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

673

732

Gross Unrealized Gains

6

1

Gross Unrealized Losses

(121)

(112)

558

621

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

1,086

841

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

914

1,055

Gross Unrealized Gains

16

12

Gross Unrealized Losses

(1)

(3)

929

1,064

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

377

451

Gross Unrealized Gains

17

19

Gross Unrealized Losses

(1)

394

469

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

2,183

2,922

Gross Unrealized Gains

49

49

Gross Unrealized Losses

(73)

(127)

2,159

2,844

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

812

797

Gross Unrealized Gains

14

7

Gross Unrealized Losses

(32)

(52)

794

752

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

2,640

2,907

Gross Unrealized Gains

23

19

Gross Unrealized Losses

(40)

(104)

2,623

2,822

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

2,640

2,907

Gross Unrealized Gains

23

19

Gross Unrealized Losses

(40)

(104)

2,623

2,822

Perpetual Preferred Securities [Member] | Other Investments: [Member]

176

195

Gross Unrealized Gains

2

8

Gross Unrealized Losses

(8)

(12)

170

191

Other Investments: [Member]

956

785

Gross Unrealized Gains

4

11

Gross Unrealized Losses

(8)

(12)

952

784

Other Investments: [Member] | Other Investments: [Member]

30

38

Gross Unrealized Gains

2

3

32

41

Money Market Securities [Member] | Other Investments: [Member]

750

552

750

552

Fixed-Maturity Investments [Member]

10,014

11,699

Gross Unrealized Gains

223

207

Gross Unrealized Losses

(523)

(791)

9,714

11,115

Other-Than-Temporary Impairments

$ (185)

$ (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 item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

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.

+ References+ Details

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details