Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income (loss)	$ 3,856us-gaap_ProfitLoss	$ 2,142us-gaap_ProfitLoss	$ 2,683us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization expenses	460	429	416
Amortization of premiums and accretion of discounts associated with investments, net	(664)	(738)	(698)
(Gains) losses on investments and from sales of businesses, net	(138)	(49)	272
(Gains) losses on derivatives, net	(902)mlic_GainsLossesOnDerivativesNet	1,059mlic_GainsLossesOnDerivativesNet	(561)mlic_GainsLossesOnDerivativesNet
(Income) loss from equity method investments, net of dividends or distributions	374	195	42
Interest credited to policyholder account balances	2,174	2,253	2,390
Universal life and investment-type product policy fees	(2,466)us-gaap_InsuranceCommissionsAndFees	(2,363)us-gaap_InsuranceCommissionsAndFees	(2,239)us-gaap_InsuranceCommissionsAndFees
Change in trading and fair value option securities	2	25	(100)
Change in accrued investment income	242	108	22
Change in premiums, reinsurance and other receivables	711	(368)	(422)
Change in deferred policy acquisition costs and value of business acquired, net	271	(82)	359
Change in income tax	229	334	(28)
Change in other assets	465	471	361
Change in insurance-related liabilities and policy-related balances	2,672	3,032	1,915
Change in other liabilities	(1,086)	(381)	170
Other, net	1	(7)	(46)
Net cash provided by (used in) operating activities	6,201	6,060	4,536
Cash flows from investing activities
Sales, maturities and repayments of fixed maturity securities	63,068	71,396	52,889
Sales, maturities and repayments of equity securities	186	206	245
Sales, maturities and repayments of mortgage loans	11,605	10,655	8,668
Sales, maturities and repayments of real estate and real estate joint ventures	976	87	721
Sales, maturities and repayments of other limited partnership interests	375	449	585
Purchases of fixed maturity securities	(69,256)	(70,760)	(62,136)
Purchases of equity securities	(173)	(461)	(393)
Purchases of mortgage loans	(14,769)	(12,032)	(9,448)
Purchases of real estate and real estate joint ventures	(1,876)	(1,427)	(1,447)
Purchases of other limited partnership interests	(773)	(675)	(660)
Cash received in connection with freestanding derivatives	740	560	634
Cash paid in connection with freestanding derivatives	(1,050)	(1,171)	(443)
Dividend of subsidiary	(49)us-gaap_CashDivestedFromDeconsolidation	0us-gaap_CashDivestedFromDeconsolidation	0us-gaap_CashDivestedFromDeconsolidation
Receipts on loans to affiliates	75	0	0
Issuances of loans to affiliates	(100)us-gaap_PaymentsForAdvanceToAffiliate	0us-gaap_PaymentsForAdvanceToAffiliate	0us-gaap_PaymentsForAdvanceToAffiliate
Purchases of loans to affiliates	(437)	0	0
Net change in policy loans	(70)	(57)	(50)
Net change in short-term investments	1,472	900	(567)
Net change in other invested assets	(254)mlic_NetChangeInOtherInvestedAssets	(460)mlic_NetChangeInOtherInvestedAssets	(791)mlic_NetChangeInOtherInvestedAssets
Net change in property, equipment and leasehold improvements	(140)	(76)	(71)
Other, net	17	0	0
Net cash provided by (used in) investing activities	(10,433)	(2,866)	(12,264)
Cash flows from financing activities
Policyholder account balances: Deposits	54,902	50,018	61,647
Policyholder account balances: Withdrawals	(51,210)	(52,020)	(56,373)
Net change in payables for collateral under securities loaned and other transactions	3,071	(1,365)	2,181
Net change in short-term debt	(320)	75	(1)
Long-term debt issued	4	481	79
Long-term debt repaid	(390)us-gaap_RepaymentsOfLongTermDebt	(27)us-gaap_RepaymentsOfLongTermDebt	(81)us-gaap_RepaymentsOfLongTermDebt
Cash received in connection with redeemable noncontrolling interests	0	774	0
Dividends on common stock	(708)us-gaap_PaymentsOfDividendsCommonStock	(1,428)us-gaap_PaymentsOfDividendsCommonStock	(1,023)us-gaap_PaymentsOfDividendsCommonStock
Other, net	(222)	(5)	611
Net cash provided by (used in) financing activities	5,127	(3,497)	7,040
Change in cash and cash equivalents	895	(303)	(688)
Cash and cash equivalents, beginning of year	1,098	1,401	2,089
Cash and cash equivalents, end of year	1,993	1,098	1,401
Supplemental disclosures of cash flow information
Net cash paid for Interest	150us-gaap_InterestPaid	152us-gaap_InterestPaid	151us-gaap_InterestPaid
Net cash paid (received) for income tax	1,304us-gaap_IncomeTaxesPaidNet	822us-gaap_IncomeTaxesPaidNet	842us-gaap_IncomeTaxesPaidNet
Non-cash transactions:
Capital contributions from MetLife, Inc.	4	3	3
Real estate and real estate joint ventures acquired in satisfaction of debt	3us-gaap_TransferToOtherRealEstate	18us-gaap_TransferToOtherRealEstate	264us-gaap_TransferToOtherRealEstate
Reduction of redeemable noncontrolling interests	774	0	0
Reduction of long-term debt	413us-gaap_NotesReduction	0us-gaap_NotesReduction	0us-gaap_NotesReduction
Reduction of real estate and real estate joint ventures	1,132us-gaap_TransferOfOtherRealEstate	0us-gaap_TransferOfOtherRealEstate	0us-gaap_TransferOfOtherRealEstate
Issuance of short-term debt	245us-gaap_NotesIssued1	0us-gaap_NotesIssued1	0us-gaap_NotesIssued1
Returns of capital	76	0	0
Disposal of subsidiary:
Assets disposed	69	0	0
Liabilities disposed	(34)	0	0
Dividends, Common Stock, Paid-in-kind	35us-gaap_DividendsCommonStockPaidinkind	0us-gaap_DividendsCommonStockPaidinkind	0us-gaap_DividendsCommonStockPaidinkind
Cash disposed	(49)us-gaap_CashDivestedFromDeconsolidation	0us-gaap_CashDivestedFromDeconsolidation	0us-gaap_CashDivestedFromDeconsolidation
Dividend of interests in subsidiary	14	0	0
Loss on dividend of interests in subsidiary	$ 0	$ 0	$ 0

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Net change in payables for collateral under securities loaned and other transactions.

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Supplemental capital contribution from parent.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in payment-in-kind (PIK).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Value transferred out of real estate owned (REO) in noncash transactions.

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