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Investments (Schedule Of Other Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Cost-method Investments [Line Items] |  |
Other investments (cost – $4,417 and $4,270) | $ 4,672 | $ 4,519
Other Investments and Securities, at Cost | 4,417 | 4,270
Fair Value |  |
Schedule of Cost-method Investments [Line Items] |  |
Investment Funds | 270 | 251
Limited Partnerships | 549 | 730
Investment Funds Limited Partnerships Partially Owned Investment Companies Total | 2,803 | 2,645
Life Settlement Contracts, Fair Value Method, Face Value | 305 | 248
Policy Loans Investments | 244 | 209
Trading Securities | 333 | 296
Other Other Investments | 168 | 140
Other investments (cost – $4,417 and $4,270) | 4,672 | 4,519
Cost |  |
Schedule of Cost-method Investments [Line Items] |  |
Investment Funds | 123 | 126
Limited Partnerships | 441 | 607
Investment Funds Limited Partnerships Partially Owned Investment Companies Total | 2,803 | 2,645
Life Settlement Contracts, Fair Value Method, Face Value | 305 | 248
Policy Loans Investments | 244 | 209
Trading Securities | 333 | 295
Other Other Investments | 168 | 140
Other Investments and Securities, at Cost | $ 4,417 | $ 4,270

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- Definition Total of alternative investments. + References No definition available. + Details
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- Definition Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610 + Details
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- Definition Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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