Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Short-term investments	$ 16,906	$ 17,310
Mortgage Loans on Real Estate, Commercial and Consumer, Net	56,592	56,915
Mortgage loans held-for-sale	49	10,716
Total derivative assets	13,777	16,200
Other Investments	21,145	23,581
Net embedded derivatives within asset host contracts	418	293
Separate account assets	235,393	203,023
Liabilities [Abstract]
Total derivative liabilities	5,536	4,011
Net embedded derivatives within liability host contracts	3,684	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	2,715	3,187
Other Investments	81	98
Recurring [Member]
Assets [Abstract]
Actively Traded Securities	16,348	18,268
Short-term investments	16,150	16,860
Total mortgage loans	2,715	13,854
Mortgage loans held-for-sale	49	10,716
MSRs	0	666
Investment funds	426	436
Total derivative assets	13,777	16,200
Other Investments	14,203	17,302
Net embedded derivatives within asset host contracts	506	363
Separate account assets	235,393	203,023
Total assets	662,472	622,964
Liabilities [Abstract]
Total derivative liabilities	5,536	4,011
Net embedded derivatives within liability host contracts	3,684	4,584
Liability related to securitized reverse residential mortgage loans	0	7,626
Trading liabilities	163	127
Total liabilities	11,910	19,416
Recurring [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	9,855	10,796
Liabilities [Abstract]
Total derivative liabilities	3,068	2,480
Recurring [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	867	1,378
Liabilities [Abstract]
Total derivative liabilities	1,528	1,120
Recurring [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	90	330
Liabilities [Abstract]
Total derivative liabilities	39	113
Recurring [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	2,965	3,696
Liabilities [Abstract]
Total derivative liabilities	901	298
Recurring [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	659	473
Recurring [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	183	267
Recurring [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	15,465	17,411
Recurring [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	41	117
Recurring [Member] \| Variable interest entities
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,666	3,138
Liabilities [Abstract]
Long-term debt of CSEs	2,527	3,068
Recurring [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	374,266	350,271
Recurring [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	114,126	105,785
Recurring [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	67,184	64,018
Recurring [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	57,336	52,536
Recurring [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	37,479	42,637
Recurring [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	47,967	40,012
Recurring [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	19,129	19,069
Recurring [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	15,997	12,979
Recurring [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	15,048	13,235
Recurring [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,891	3,023
Recurring [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,162	2,205
Recurring [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	729	818
Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Actively Traded Securities	9,110	7,572
Short-term investments	9,426	8,150
Total mortgage loans	0	0
Mortgage loans held-for-sale	0	0
MSRs	0	0
Investment funds	303	312
Total derivative assets	19	62
Other Investments	322	374
Net embedded derivatives within asset host contracts	0	0
Separate account assets	31,620	28,191
Total assets	78,851	65,093
Liabilities [Abstract]
Total derivative liabilities	170	103
Net embedded derivatives within liability host contracts	0	0
Liability related to securitized reverse residential mortgage loans	0	0
Trading liabilities	163	124
Total liabilities	333	227
Recurring [Member] \| Level 1 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	1	32
Liabilities [Abstract]
Total derivative liabilities	38	91
Recurring [Member] \| Level 1 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	4	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	14	29
Liabilities [Abstract]
Total derivative liabilities	132	12
Recurring [Member] \| Level 1 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	7	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	9,103	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	27,441	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	0	0
Recurring [Member] \| Level 1 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	27,441	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	932	819
Recurring [Member] \| Level 1 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	932	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	6,263	9,287
Short-term investments	6,295	8,120
Total mortgage loans	2,666	12,440
Mortgage loans held-for-sale	0	9,302
MSRs	0	0
Investment funds	123	124
Total derivative assets	12,992	14,746
Other Investments	13,115	14,870
Net embedded derivatives within asset host contracts	1	1
Separate account assets	202,568	173,507
Total assets	556,663	532,229
Liabilities [Abstract]
Total derivative liabilities	4,985	3,750
Net embedded derivatives within liability host contracts	17	19
Liability related to securitized reverse residential mortgage loans	0	6,451
Trading liabilities	0	3
Total liabilities	7,485	13,175
Recurring [Member] \| Level 2 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	9,648	10,426
Liabilities [Abstract]
Total derivative liabilities	3,001	2,351
Recurring [Member] \| Level 2 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	819	1,316
Liabilities [Abstract]
Total derivative liabilities	1,521	1,103
Recurring [Member] \| Level 2 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	47	301
Liabilities [Abstract]
Total derivative liabilities	39	85
Recurring [Member] \| Level 2 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	2,478	2,703
Liabilities [Abstract]
Total derivative liabilities	424	211
Recurring [Member] \| Level 2 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	646	473
Recurring [Member] \| Level 2 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	151	244
Recurring [Member] \| Level 2 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	5,425	8,453
Recurring [Member] \| Level 2 [Member] \| FVO securities held by consolidated securitization entities [Member]
Assets [Abstract]
Actively Traded Securities	41	117
Recurring [Member] \| Level 2 [Member] \| Variable interest entities
Assets [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	2,666	3,138
Liabilities [Abstract]
Long-term debt of CSEs	2,483	2,952
Recurring [Member] \| Level 2 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	324,405	312,519
Recurring [Member] \| Level 2 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	106,693	99,001
Recurring [Member] \| Level 2 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	60,976	59,648
Recurring [Member] \| Level 2 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	55,522	50,138
Recurring [Member] \| Level 2 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	35,442	41,035
Recurring [Member] \| Level 2 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	20,455	20,070
Recurring [Member] \| Level 2 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	17,982	18,316
Recurring [Member] \| Level 2 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	12,341	11,129
Recurring [Member] \| Level 2 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	14,994	13,182
Recurring [Member] \| Level 2 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,350	1,485
Recurring [Member] \| Level 2 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,040	1,105
Recurring [Member] \| Level 2 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	310	380
Recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Actively Traded Securities	975	1,409
Short-term investments	429	590
Total mortgage loans	49	1,414
Mortgage loans held-for-sale	49	1,414
MSRs	0	666
Investment funds	0	0
Total derivative assets	766	1,392
Other Investments	766	2,058
Net embedded derivatives within asset host contracts	505	362
Separate account assets	1,205	1,325
Total assets	26,958	25,642
Liabilities [Abstract]
Total derivative liabilities	381	158
Net embedded derivatives within liability host contracts	3,667	4,565
Liability related to securitized reverse residential mortgage loans	0	1,175
Trading liabilities	0	0
Total liabilities	4,092	6,014
Recurring [Member] \| Level 3 [Member] \| Interest rate contracts [Member]
Assets [Abstract]
Total derivative assets	206	338
Liabilities [Abstract]
Total derivative liabilities	29	38
Recurring [Member] \| Level 3 [Member] \| Foreign currency contracts [Member]
Assets [Abstract]
Total derivative assets	44	61
Liabilities [Abstract]
Total derivative liabilities	7	17
Recurring [Member] \| Level 3 [Member] \| Credit contracts [Member]
Assets [Abstract]
Total derivative assets	43	29
Liabilities [Abstract]
Total derivative liabilities	0	28
Recurring [Member] \| Level 3 [Member] \| Equity market contracts [Member]
Assets [Abstract]
Total derivative assets	473	964
Liabilities [Abstract]
Total derivative liabilities	345	75
Recurring [Member] \| Level 3 [Member] \| Trading Account Assets [Member]
Assets [Abstract]
Actively Traded Securities	6	0
Recurring [Member] \| Level 3 [Member] \| FVO general account securities [Member]
Assets [Abstract]
Actively Traded Securities	32	23
Recurring [Member] \| Level 3 [Member] \| FVO contractholder-directed unit-linked investments [Member]
Assets [Abstract]
Actively Traded Securities	937	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	44	116
Recurring [Member] \| Level 3 [Member] \| Fixed maturity securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	22,420	17,765
Recurring [Member] \| Level 3 [Member] \| U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	7,433	6,784
Recurring [Member] \| Level 3 [Member] \| Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	6,208	4,370
Recurring [Member] \| Level 3 [Member] \| Foreign government debt securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,814	2,322
Recurring [Member] \| Level 3 [Member] \| RMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	2,037	1,602
Recurring [Member] \| Level 3 [Member] \| U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	71	31
Recurring [Member] \| Level 3 [Member] \| CMBS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	1,147	753
Recurring [Member] \| Level 3 [Member] \| ABS [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	3,656	1,850
Recurring [Member] \| Level 3 [Member] \| State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	54	53
Recurring [Member] \| Level 3 [Member] \| Equity Securities [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	609	719
Recurring [Member] \| Level 3 [Member] \| Common Stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	190	281
Recurring [Member] \| Level 3 [Member] \| Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale securities, fair value disclosure	$ 419	$ 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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Period Type:	instant

- Definition

Fair value of investments in fund assets.

+ References

No definition available.

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Period Type:	instant

- 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
Balance Type:	credit
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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- Definition

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

-Subparagraph (b)

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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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-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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-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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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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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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