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Investments (Available-For-Sale In The Consolidated Investment Portfolio) (Details) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2011

Dec. 31, 2010

Schedule of Available-for-sale Securities [Line Items]

$ 9,025

$ 12,822

Gross Unrealized Gains

263

220

Gross Unrealized Losses

(478)

(804)

8,810

12,238

Other-Than-Temporary Impairments

(233)

^[1]

(241)

^[1]

Fixed-Maturity Investments [Member]

Schedule of Available-for-sale Securities [Line Items]

7,492

11,699

Gross Unrealized Gains

262

207

Gross Unrealized Losses

(418)

(791)

7,336

11,115

Other-Than-Temporary Impairments

(233)

^[1]

(241)

^[1]

Other Long Term Investments [Member]

Schedule of Available-for-sale Securities [Line Items]

1,060

785

Gross Unrealized Gains

1

11

Gross Unrealized Losses

(19)

(12)

1,042

784

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

Schedule of Available-for-sale Securities [Line Items]

6,370

8,792

Gross Unrealized Gains

221

188

Gross Unrealized Losses

(416)

(687)

6,175

8,293

Other-Than-Temporary Impairments

(233)

^[1]

(241)

^[1]

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

Schedule of Available-for-sale Securities [Line Items]

127

195

Gross Unrealized Gains

8

Gross Unrealized Losses

(19)

(12)

108

191

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

Schedule of Available-for-sale Securities [Line Items]

22

38

Gross Unrealized Gains

1

3

23

41

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

Schedule of Available-for-sale Securities [Line Items]

911

552

911

552

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

Schedule of Available-for-sale Securities [Line Items]

1,091

1,055

Gross Unrealized Gains

39

12

Gross Unrealized Losses

(3)

1,130

1,064

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

Schedule of Available-for-sale Securities [Line Items]

326

451

Gross Unrealized Gains

23

19

Gross Unrealized Losses

(1)

349

469

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

Schedule of Available-for-sale Securities [Line Items]

1,698

2,922

Gross Unrealized Gains

43

49

Gross Unrealized Losses

(106)

(127)

1,635

2,844

Other-Than-Temporary Impairments

(2)

^[1]

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

Schedule of Available-for-sale Securities [Line Items]

903

797

Gross Unrealized Gains

35

7

Gross Unrealized Losses

(17)

(52)

921

752

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

Schedule of Available-for-sale Securities [Line Items]

1,122

2,907

Gross Unrealized Gains

41

19

Gross Unrealized Losses

(2)

(104)

1,161

2,822

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

Schedule of Available-for-sale Securities [Line Items]

1,122

2,907

Gross Unrealized Gains

41

19

Gross Unrealized Losses

(2)

(104)

1,161

2,822

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

Schedule of Available-for-sale Securities [Line Items]

1,198

1,537

Gross Unrealized Gains

47

39

Gross Unrealized Losses

(13)

1,245

1,563

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

Schedule of Available-for-sale Securities [Line Items]

325

627

Gross Unrealized Gains

31

36

Gross Unrealized Losses

(83)

(180)

273

483

Other-Than-Temporary Impairments

(125)

^[1]

(155)

^[1]

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

Schedule of Available-for-sale Securities [Line Items]

58

199

Gross Unrealized Gains

1

24

Gross Unrealized Losses

(10)

(19)

49

204

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

Schedule of Available-for-sale Securities [Line Items]

251

472

Gross Unrealized Gains

1

Gross Unrealized Losses

(118)

(180)

133

293

Other-Than-Temporary Impairments

(69)

^[1]

(86)

^[1]

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

Schedule of Available-for-sale Securities [Line Items]

520

732

Gross Unrealized Gains

2

1

Gross Unrealized Losses

(82)

(112)

440

621

Other-Than-Temporary Impairments

(37)

^[1]

Variable Interest Entities [Member] | Fixed-Maturity Investments [Member]

Schedule of Available-for-sale Securities [Line Items]

274

233

Variable Interest Entities [Member] | Corporate Obligations [Member]

Schedule of Available-for-sale Securities [Line Items]

2

2

Variable Interest Entities [Member] | Money Market Securities [Member] | Other Long Term Investments [Member]

Schedule of Available-for-sale Securities [Line Items]

199

149

199

149

Variable Interest Entities [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member]

Schedule of Available-for-sale Securities [Line Items]

119

Gross Unrealized Losses

(26)

93

Variable Interest Entities [Member] | Asset-Backed Securities [Member] | Collateralized Debt Obligations [Member]

Schedule of Available-for-sale Securities [Line Items]

112

91

Gross Unrealized Losses

(15)

(1)

97

90

Variable Interest Entities [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member]

Schedule of Available-for-sale Securities [Line Items]

41

98

Gross Unrealized Gains

2

$ 41

$ 100

[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