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Investments (Details 5) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Net Investment Income [Line Items] |  |
Investment income | $ 393 us-gaap_GrossInvestmentIncomeOperating | $ 366 us-gaap_GrossInvestmentIncomeOperating
Investment expenses | (5)us-gaap_InvestmentIncomeInvestmentExpense | (5)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income | 388 us-gaap_NetInvestmentIncome | 361 us-gaap_NetInvestmentIncome
Fixed maturities [Member] |  |
Net Investment Income [Line Items] |  |
Investment income | 352 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 327 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity securities [Member] |  |
Net Investment Income [Line Items] |  |
Investment income | 17 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 16 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Equity method investments [Member] |  |
Net Investment Income [Line Items] |  |
Investment income | 3 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember | 6 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember
Other [Member] |  |
Net Investment Income [Line Items] |  |
Investment income | $ 21 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherLongTermInvestmentsMember | $ 17 us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherLongTermInvestmentsMember

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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