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

Mar. 31, 2012

Dec. 31, 2011

Variable Interest Entity [Line Items]

$ 8,692

$ 9,025

Gross Unrealized Gains

255

263

Gross Unrealized Losses

(278)

(478)

8,669

8,810

Other-Than-Temporary Impairments

(180)

^[1]

(233)

^[1]

Fixed-Maturity Investments [Member]

Variable Interest Entity [Line Items]

6,787

7,492

Gross Unrealized Gains

252

262

Gross Unrealized Losses

(247)

(418)

6,792

7,336

Other-Than-Temporary Impairments

(180)

^[1]

(233)

^[1]

Total Other Investments [Member]

Variable Interest Entity [Line Items]

1,019

1,060

Gross Unrealized Gains

2

1

Gross Unrealized Losses

(19)

1,021

1,042

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

Variable Interest Entity [Line Items]

49

127

Gross Unrealized Losses

(19)

49

108

Total Other Investments [Member] | Total Other Investments [Member]

Variable Interest Entity [Line Items]

19

22

Gross Unrealized Gains

2

1

21

23

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

Variable Interest Entity [Line Items]

951

911

951

911

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

Variable Interest Entity [Line Items]

5,752

6,370

Gross Unrealized Gains

206

221

Gross Unrealized Losses

(246)

(416)

5,712

6,175

Other-Than-Temporary Impairments

(180)

^[1]

(233)

^[1]

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

Variable Interest Entity [Line Items]

1,039

1,091

Gross Unrealized Gains

30

39

Gross Unrealized Losses

(4)

1,065

1,130

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

Variable Interest Entity [Line Items]

344

326

Gross Unrealized Gains

23

23

367

349

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

Variable Interest Entity [Line Items]

1,558

1,698

Gross Unrealized Gains

45

43

Gross Unrealized Losses

(37)

(106)

1,566

1,635

Other-Than-Temporary Impairments

(2)

^[1]

(2)

^[1]

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

Variable Interest Entity [Line Items]

924

903

Gross Unrealized Gains

46

35

Gross Unrealized Losses

(20)

(17)

950

921

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

Variable Interest Entity [Line Items]

1,035

1,122

Gross Unrealized Gains

46

41

Gross Unrealized Losses

(1)

(2)

1,080

1,161

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

Variable Interest Entity [Line Items]

1,444

1,432

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

Variable Interest Entity [Line Items]

1,126

1,198

Gross Unrealized Gains

47

47

1,173

1,245

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

Variable Interest Entity [Line Items]

267

325

Gross Unrealized Gains

13

31

Gross Unrealized Losses

(65)

(83)

215

273

Other-Than-Temporary Impairments

(119)

^[1]

(125)

^[1]

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

Variable Interest Entity [Line Items]

51

58

Gross Unrealized Gains

1

Gross Unrealized Losses

(7)

(10)

44

49

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

Variable Interest Entity [Line Items]

443

332

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

Variable Interest Entity [Line Items]

200

251

Gross Unrealized Losses

(94)

(118)

106

133

Other-Than-Temporary Impairments

(59)

^[1]

(69)

^[1]

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

Variable Interest Entity [Line Items]

243

520

Gross Unrealized Gains

2

2

Gross Unrealized Losses

(19)

(82)

226

440

Other-Than-Temporary Impairments

(37)

^[1]

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

Variable Interest Entity [Line Items]

264

234

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

Variable Interest Entity [Line Items]

2

2

2

2

Variable Interest Entity [Member] | Money Market Securities [Member] | Total Other Investments [Member]

Variable Interest Entity [Line Items]

622

199

622

199

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

Variable Interest Entity [Line Items]

114

95

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

Variable Interest Entity [Line Items]

114

119

Gross Unrealized Losses

(19)

(26)

95

93

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

Variable Interest Entity [Line Items]

148

137

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

Variable Interest Entity [Line Items]

112

112

Gross Unrealized Losses

(12)

(15)

100

97

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

Variable Interest Entity [Line Items]

36

41

Gross Unrealized Gains

1

$ 37

$ 41

[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.

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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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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.

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