Fair Value (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets [Abstract]
Short-term investments	$ 14,678	$ 17,310
Mortgage Loans on Real Estate, Commercial and Consumer, Net	57,884	56,915
Mortgage loans held-for-sale	64	10,716
Total derivative assets	15,728	16,200
Other Investments	23,477	23,581
Net embedded derivatives within asset host contracts	332	293
Separate account assets	237,373	203,023
Liabilities [Abstract]
Total derivative liabilities	4,711	4,011
Net embedded derivatives within liability host contracts	4,369	4,584
Liability related to securitized reverse residential mortgage loans	0	7,626
Variable interest entities
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,928	3,187
Other Investments	81	98
Liabilities [Abstract]
Long-term debt of CSEs	2,733	3,068
Recurring [Member]
Assets [Abstract]
Actively Traded Securities	15,995	18,268
Short-term investments	13,795	16,860
Total mortgage loans	2,943	13,854
Mortgage loans held-for-sale	64	10,716
MSRs	490	666
Investment funds	396	436
Total derivative assets	15,728	16,200
Other Investments	16,614	17,302
Net embedded derivatives within asset host contracts	429	363
Separate account assets	237,373	203,023
Total assets	667,957	622,964
Liabilities [Abstract]
Total derivative liabilities	4,711	4,011
Net embedded derivatives within liability host contracts	4,369	4,584
Liability related to securitized reverse residential mortgage loans	0	7,626
Trading liabilities	121	127
Total liabilities	11,934	19,416
Recurring [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	11,360	10,796
Liabilities [Abstract]
Total derivative liabilities	2,777	2,480
Recurring [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	926	1,378
Liabilities [Abstract]
Total derivative liabilities	1,301	1,120
Recurring [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	100	330
Liabilities [Abstract]
Total derivative liabilities	41	113
Recurring [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	3,342	3,696
Liabilities [Abstract]
Total derivative liabilities	592	298
Recurring [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	565	473
Recurring [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	178	267
Recurring [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	15,199	17,411
Recurring [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	53	117
Recurring [Member] \| Variable interest entities
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,879	3,138
Liabilities [Abstract]
Long-term debt of CSEs	2,733	3,068
Recurring [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	378,005	350,271
Recurring [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	113,942	105,785
Recurring [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	65,257	64,018
Recurring [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	57,405	52,536
Recurring [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	40,591	42,637
Recurring [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	51,448	40,012
Recurring [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	19,440	19,069
Recurring [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	14,917	12,979
Recurring [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	15,005	13,235
Recurring [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,803	3,023
Recurring [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,069	2,205
Recurring [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	734	818
Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Actively Traded Securities	8,568	7,572
Short-term investments	7,108	8,150
Total mortgage loans	0	0
Mortgage loans held-for-sale	0	0
MSRs	0	0
Investment funds	269	312
Total derivative assets	75	62
Other Investments	344	374
Net embedded derivatives within asset host contracts	0	0
Separate account assets	34,037	28,191
Total assets	80,598	65,093
Liabilities [Abstract]
Total derivative liabilities	22	103
Net embedded derivatives within liability host contracts	0	0
Liability related to securitized reverse residential mortgage loans	0	0
Trading liabilities	118	124
Total liabilities	140	227
Recurring [Member] \| Level 1 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	10	32
Liabilities [Abstract]
Total derivative liabilities	20	91
Recurring [Member] \| Level 1 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	0	1
Liabilities [Abstract]
Total derivative liabilities	0	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	65	29
Liabilities [Abstract]
Total derivative liabilities	2	12
Recurring [Member] \| Level 1 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	3	0
Recurring [Member] \| Level 1 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	0	0
Recurring [Member] \| Level 1 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	8,565	7,572
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
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	29,681	19,987
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	76
Recurring [Member] \| Level 1 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,009	0
Recurring [Member] \| Level 1 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	28,672	19,911
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	860	819
Recurring [Member] \| Level 1 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	860	819
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	6,261	9,287
Short-term investments	5,590	8,120
Total mortgage loans	2,879	12,440
Mortgage loans held-for-sale	0	9,302
MSRs	0	0
Investment funds	127	124
Total derivative assets	14,743	14,746
Other Investments	14,870	14,870
Net embedded derivatives within asset host contracts	1	1
Separate account assets	201,929	173,507
Total assets	558,734	532,229
Liabilities [Abstract]
Total derivative liabilities	4,419	3,750
Net embedded derivatives within liability host contracts	19	19
Liability related to securitized reverse residential mortgage loans	0	6,451
Trading liabilities	3	3
Total liabilities	7,126	13,175
Recurring [Member] \| Level 2 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	11,106	10,426
Liabilities [Abstract]
Total derivative liabilities	2,730	2,351
Recurring [Member] \| Level 2 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	864	1,316
Liabilities [Abstract]
Total derivative liabilities	1,297	1,103
Recurring [Member] \| Level 2 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	59	301
Liabilities [Abstract]
Total derivative liabilities	40	85
Recurring [Member] \| Level 2 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	2,714	2,703
Liabilities [Abstract]
Total derivative liabilities	352	211
Recurring [Member] \| Level 2 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	548	473
Recurring [Member] \| Level 2 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	147	244
Recurring [Member] \| Level 2 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	5,513	8,453
Recurring [Member] \| Level 2 [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	53	117
Recurring [Member] \| Level 2 [Member] \| Variable interest entities
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,879	3,138
Liabilities [Abstract]
Long-term debt of CSEs	2,685	2,952
Recurring [Member] \| Level 2 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	325,949	312,519
Recurring [Member] \| Level 2 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	106,243	99,001
Recurring [Member] \| Level 2 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	59,947	59,648
Recurring [Member] \| Level 2 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	54,815	50,138
Recurring [Member] \| Level 2 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	37,009	41,035
Recurring [Member] \| Level 2 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	22,702	20,070
Recurring [Member] \| Level 2 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	18,226	18,316
Recurring [Member] \| Level 2 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	14,852	11,129
Recurring [Member] \| Level 2 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	12,155	13,182
Recurring [Member] \| Level 2 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,255	1,485
Recurring [Member] \| Level 2 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	947	1,105
Recurring [Member] \| Level 2 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	308	380
Recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Actively Traded Securities	1,166	1,409
Short-term investments	1,097	590
Total mortgage loans	64	1,414
Mortgage loans held-for-sale	64	1,414
MSRs	490	666
Investment funds	0	0
Total derivative assets	910	1,392
Other Investments	1,400	2,058
Net embedded derivatives within asset host contracts	428	362
Separate account assets	1,407	1,325
Total assets	28,625	25,642
Liabilities [Abstract]
Total derivative liabilities	270	158
Net embedded derivatives within liability host contracts	4,350	4,565
Liability related to securitized reverse residential mortgage loans	0	1,175
Trading liabilities	0	0
Total liabilities	4,668	6,014
Recurring [Member] \| Level 3 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	244	338
Liabilities [Abstract]
Total derivative liabilities	27	38
Recurring [Member] \| Level 3 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	62	61
Liabilities [Abstract]
Total derivative liabilities	4	17
Recurring [Member] \| Level 3 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	41	29
Liabilities [Abstract]
Total derivative liabilities	1	28
Recurring [Member] \| Level 3 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	563	964
Liabilities [Abstract]
Total derivative liabilities	238	75
Recurring [Member] \| Level 3 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	14	0
Recurring [Member] \| Level 3 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	31	23
Recurring [Member] \| Level 3 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	1,121	1,386
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
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	0	0
Liabilities [Abstract]
Long-term debt of CSEs	48	116
Recurring [Member] \| Level 3 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	22,375	17,765
Recurring [Member] \| Level 3 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	7,699	6,784
Recurring [Member] \| Level 3 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	5,310	4,370
Recurring [Member] \| Level 3 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,590	2,322
Recurring [Member] \| Level 3 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,573	1,602
Recurring [Member] \| Level 3 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	74	31
Recurring [Member] \| Level 3 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,214	753
Recurring [Member] \| Level 3 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	65	1,850
Recurring [Member] \| Level 3 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,850	53
Recurring [Member] \| Level 3 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	688	719
Recurring [Member] \| Level 3 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	262	281
Recurring [Member] \| Level 3 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	$ 426	$ 438

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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Data Type:	xbrli:monetaryItemType
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- Definition

Fair value of investments in fund assets.

+ References

No definition available.

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- Definition

This element represents the liability related to securitized reverse residential mortgage loans for which the fair value option was elected.

+ References

No definition available.

+ Details

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Namespace Prefix:	met_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- 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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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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

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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-Name Accounting Standards Codification

-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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-Paragraph 4B

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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 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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- Definition

This element represents the aggregate of the liabilities 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

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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.

+ References

No definition available.

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- Definition

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)

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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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Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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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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