Mergers	12 Months Ended
Dec. 31, 2016
Business Combinations [Abstract]
Mergers	3. Mergers In November 2014, MetLife Insurance Company of Connecticut, a wholly-owned subsidiary of MetLife, Inc., re-domesticated from Connecticut to Delaware, changed its name to MetLife Insurance Company USA and merged with its subsidiary, MLI-USA, and its affiliate, MLIIC, each a U.S. insurance company that issued variable annuity products in addition to other products, and Exeter, a former offshore, captive reinsurance subsidiary of MetLife, Inc. and affiliate of MetLife Insurance Company of Connecticut that mainly reinsured guarantees associated with variable annuity products (the “Mergers”). The surviving entity of the Mergers was MetLife USA. Exeter, formerly a Cayman Islands company, was re-domesticated to Delaware in October 2013. Prior to the Mergers, 40,000,000 authorized shares of common stock, of which 30,000,000 shares were issued and outstanding, were converted to 4,000 authorized shares of common stock, of which 3,000 shares were issued and outstanding. Prior to the Mergers, effective January 1, 2014, following receipt of New York State Department of Financial Services approval, MetLife Insurance Company of Connecticut withdrew its license to issue insurance policies and annuity contracts in New York. Also effective January 1, 2014, MetLife Insurance Company of Connecticut reinsured with MLIC, an affiliate, all existing New York insurance policies and annuity contracts that include a separate account feature and deposited investments with an estimated fair market value of $6.3 billion into a custodial account to secure MetLife Insurance Company of Connecticut’s remaining New York policyholder liabilities not covered by such reinsurance. Also prior to the Mergers, certain risks ceded to Exeter were recaptured. See Notes 8, 9 and 13 for information regarding additional transactions in connection with the Mergers. The Mergers represent a transaction among entities under common control and have been accounted for in a manner similar to the pooling-of-interests method, which requires that the merged entities be combined at their historical cost. The Company’s consolidated financial statements and related footnotes are presented as if the transaction occurred at the beginning of the earliest date presented and the prior periods have been retrospectively adjusted.

In November 2014, MetLife Insurance Company of Connecticut, a wholly-owned subsidiary of MetLife, Inc., re-domesticated from Connecticut to Delaware, changed its name to MetLife Insurance Company USA and merged with its subsidiary, MLI-USA, and its affiliate, MLIIC, each a U.S. insurance company that issued variable annuity products in addition to other products, and Exeter, a former offshore, captive reinsurance subsidiary of MetLife, Inc. and affiliate of MetLife Insurance Company of Connecticut that mainly reinsured guarantees associated with variable annuity products (the “Mergers”). The surviving entity of the Mergers was MetLife USA. Exeter, formerly a Cayman Islands company, was re-domesticated to Delaware in October 2013. Prior to the Mergers, 40,000,000 authorized shares of common stock, of which 30,000,000 shares were issued and outstanding, were converted to 4,000 authorized shares of common stock, of which 3,000 shares were issued and outstanding.

Prior to the Mergers, effective January 1, 2014, following receipt of New York State Department of Financial Services approval, MetLife Insurance Company of Connecticut withdrew its license to issue insurance policies and annuity contracts in New York. Also effective January 1, 2014, MetLife Insurance Company of Connecticut reinsured with MLIC, an affiliate, all existing New York insurance policies and annuity contracts that include a separate account feature and deposited investments with an estimated fair market value of $6.3 billion into a custodial account to secure MetLife Insurance Company of Connecticut’s remaining New York policyholder liabilities not covered by such reinsurance. Also prior to the Mergers, certain risks ceded to Exeter were recaptured. See Notes 8, 9 and 13 for information regarding additional transactions in connection with the Mergers.

The Mergers represent a transaction among entities under common control and have been accounted for in a manner similar to the pooling-of-interests method, which requires that the merged entities be combined at their historical cost. The Company’s consolidated financial statements and related footnotes are presented as if the transaction occurred at the beginning of the earliest date presented and the prior periods have been retrospectively adjusted.