Fair Value (Recurring Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets [Abstract]
Short-term investments	$ 12,990	$ 16,906
Mortgage Loans on Real Estate, Commercial and Consumer, Net	55,636	56,592
Mortgage loans held-for-sale	0	49
Total derivative assets	10,434	13,777
Other Investments	17,920	21,145
Net embedded derivatives within asset host contracts	196	418
Separate account assets	245,573	235,393
Liabilities [Abstract]
Total derivative liabilities	4,945	5,536
Net embedded derivatives within liability host contracts	1,025	3,684
Variable interest entities [Member]
Assets [Abstract]
Short-term investments	13	0
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,316	2,715
Other Investments	78	81
Separate account assets	1,096	0
Recurring [Member]
Assets [Abstract]
Actively Traded Securities	16,110	16,348
Short-term investments	10,617	16,150
Residential mortgage loans - FVO	150	0
Total mortgage loans	2,418	2,715
Mortgage loans held-for-sale	0	49
Investment funds	250	426
Total derivative assets	10,434	13,777
Other Investments	10,684	14,203
Net embedded derivatives within asset host contracts	339	506
Separate account assets	245,573	235,393
Total assets	645,486	662,472
Liabilities [Abstract]
Total derivative liabilities	4,945	5,536
Net embedded derivatives within liability host contracts	1,025	3,684
Trading liabilities	236	163
Total liabilities	8,332	11,910
Recurring [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	6,629	9,855
Liabilities [Abstract]
Total derivative liabilities	2,499	3,068
Recurring [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	1,449	867
Liabilities [Abstract]
Total derivative liabilities	1,252	1,528
Recurring [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	105	90
Liabilities [Abstract]
Total derivative liabilities	45	39
Recurring [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	2,251	2,965
Liabilities [Abstract]
Total derivative liabilities	1,149	901
Recurring [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	744	659
Recurring [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	189	183
Recurring [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	15,150	15,465
Recurring [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	27	41
Recurring [Member] \| Variable interest entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,268	2,666
Liabilities [Abstract]
Long-term debt of CSEs	2,126	2,527
Recurring [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	356,514	374,266
Recurring [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	109,008	114,126
Recurring [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	64,186	67,184
Recurring [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	52,297	57,336
Recurring [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	36,441	37,479
Recurring [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	47,426	47,967
Recurring [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	17,263	19,129
Recurring [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	15,655	15,997
Recurring [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	14,238	15,048
Recurring [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	3,231	2,891
Recurring [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,231	2,162
Recurring [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,000	729
Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Actively Traded Securities	9,452	9,110
Short-term investments	4,240	9,426
Residential mortgage loans - FVO	0	0
Total mortgage loans	0	0
Mortgage loans held-for-sale	0	0
Investment funds	163	303
Total derivative assets	22	19
Other Investments	185	322
Net embedded derivatives within asset host contracts	0	0
Separate account assets	34,193	31,620
Total assets	75,606	78,851
Liabilities [Abstract]
Total derivative liabilities	68	170
Net embedded derivatives within liability host contracts	0	0
Trading liabilities	236	163
Total liabilities	304	333
Recurring [Member] \| Level 1 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	11	1
Liabilities [Abstract]
Total derivative liabilities	13	38
Recurring [Member] \| Level 1 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	0	4
Liabilities [Abstract]
Total derivative liabilities	2	0
Recurring [Member] \| Level 1 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	0	0
Liabilities [Abstract]
Total derivative liabilities	0	0
Recurring [Member] \| Level 1 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	11	14
Liabilities [Abstract]
Total derivative liabilities	53	132
Recurring [Member] \| Level 1 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	4	7
Recurring [Member] \| Level 1 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	5	0
Recurring [Member] \| Level 1 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	9,443	9,103
Recurring [Member] \| Level 1 [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	0	0
Recurring [Member] \| Level 1 [Member] \| Variable interest entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	0	0
Liabilities [Abstract]
Long-term debt of CSEs	0	0
Recurring [Member] \| Level 1 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	26,519	27,441
Recurring [Member] \| Level 1 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	984	0
Recurring [Member] \| Level 1 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	25,535	27,441
Recurring [Member] \| Level 1 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,017	932
Recurring [Member] \| Level 1 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,017	932
Recurring [Member] \| Level 1 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	0	0
Recurring [Member] \| Level 2 [Member]
Assets [Abstract]
Actively Traded Securities	6,008	6,263
Short-term investments	6,033	6,295
Residential mortgage loans - FVO	0	0
Total mortgage loans	2,268	2,666
Mortgage loans held-for-sale	0	0
Investment funds	87	123
Total derivative assets	9,943	12,992
Other Investments	10,030	13,115
Net embedded derivatives within asset host contracts	0	1
Separate account assets	210,155	202,568
Total assets	544,549	556,663
Liabilities [Abstract]
Total derivative liabilities	4,366	4,985
Net embedded derivatives within liability host contracts	8	17
Trading liabilities	0	0
Total liabilities	6,469	7,485
Recurring [Member] \| Level 2 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	6,500	9,648
Liabilities [Abstract]
Total derivative liabilities	2,466	3,001
Recurring [Member] \| Level 2 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	1,422	819
Liabilities [Abstract]
Total derivative liabilities	1,229	1,521
Recurring [Member] \| Level 2 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	75	47
Liabilities [Abstract]
Total derivative liabilities	40	39
Recurring [Member] \| Level 2 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	1,946	2,478
Liabilities [Abstract]
Total derivative liabilities	631	424
Recurring [Member] \| Level 2 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	729	646
Recurring [Member] \| Level 2 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	138	151
Recurring [Member] \| Level 2 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	5,114	5,425
Recurring [Member] \| Level 2 [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	27	41
Recurring [Member] \| Level 2 [Member] \| Variable interest entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,268	2,666
Liabilities [Abstract]
Long-term debt of CSEs	2,095	2,483
Recurring [Member] \| Level 2 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	308,432	324,405
Recurring [Member] \| Level 2 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	103,090	106,693
Recurring [Member] \| Level 2 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	58,178	60,976
Recurring [Member] \| Level 2 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	50,326	55,522
Recurring [Member] \| Level 2 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	32,722	35,442
Recurring [Member] \| Level 2 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	21,809	20,455
Recurring [Member] \| Level 2 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	16,213	17,982
Recurring [Member] \| Level 2 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	11,897	12,341
Recurring [Member] \| Level 2 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	14,197	14,994
Recurring [Member] \| Level 2 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,623	1,350
Recurring [Member] \| Level 2 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,031	1,040
Recurring [Member] \| Level 2 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	592	310
Recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Actively Traded Securities	650	975
Short-term investments	344	429
Residential mortgage loans - FVO	150	0
Total mortgage loans	150	49
Mortgage loans held-for-sale	0	49
Investment funds	0	0
Total derivative assets	469	766
Other Investments	469	766
Net embedded derivatives within asset host contracts	339	505
Separate account assets	1,225	1,205
Total assets	25,331	26,958
Liabilities [Abstract]
Total derivative liabilities	511	381
Net embedded derivatives within liability host contracts	1,017	3,667
Trading liabilities	0	0
Total liabilities	1,559	4,092
Recurring [Member] \| Level 3 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	118	206
Liabilities [Abstract]
Total derivative liabilities	20	29
Recurring [Member] \| Level 3 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	27	44
Liabilities [Abstract]
Total derivative liabilities	21	7
Recurring [Member] \| Level 3 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	30	43
Liabilities [Abstract]
Total derivative liabilities	5	0
Recurring [Member] \| Level 3 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	294	473
Liabilities [Abstract]
Total derivative liabilities	465	345
Recurring [Member] \| Level 3 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	11	6
Recurring [Member] \| Level 3 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	46	32
Recurring [Member] \| Level 3 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	593	937
Recurring [Member] \| Level 3 [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	0	0
Recurring [Member] \| Level 3 [Member] \| Variable interest entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	0	0
Liabilities [Abstract]
Long-term debt of CSEs	31	44
Recurring [Member] \| Level 3 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	21,563	22,420
Recurring [Member] \| Level 3 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	5,918	7,433
Recurring [Member] \| Level 3 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	6,008	6,208
Recurring [Member] \| Level 3 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,971	1,814
Recurring [Member] \| Level 3 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,735	2,037
Recurring [Member] \| Level 3 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	82	71
Recurring [Member] \| Level 3 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,050	1,147
Recurring [Member] \| Level 3 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	3,758	3,656
Recurring [Member] \| Level 3 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	41	54
Recurring [Member] \| Level 3 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	591	609
Recurring [Member] \| Level 3 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	183	190
Recurring [Member] \| Level 3 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	$ 408	$ 419

Total fair value of mortgage loans as of the balance sheet date excluding amounts valued at lower of cost or market.

No definition available.

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Fair value of investments in fund assets.

+ References

No definition available.

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- Definition

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No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

-Paragraph 1

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-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 12-16, 44A, 44B

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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The fair value amount of long-term debt 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.

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No definition available.

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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Other investments not otherwise specified in the taxonomy.

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The fair value of the assets held by the Entity for the benefit of separate account policyholders.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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