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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from investing activities      
Cash disposed from sale of businesses $ 323us-gaap_CashDivestedFromDeconsolidation $ 14us-gaap_CashDivestedFromDeconsolidation $ 29us-gaap_CashDivestedFromDeconsolidation
Cash received from purchase of businesses 0us-gaap_CashAcquiredFromAcquisition 20us-gaap_CashAcquiredFromAcquisition 33us-gaap_CashAcquiredFromAcquisition
Business acquisitions:      
Cash paid excluding transaction cost $ 0met_CashPaidExcludingTransactionCosts $ 17met_CashPaidExcludingTransactionCosts $ 0met_CashPaidExcludingTransactionCosts