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Investments (Details 12) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Other details of unrealized loss |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | $ 207 |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | 42 |
Limited partnership interests | 6,206 | $ 5,814
Fixed income and equity securities |  |
Other details of unrealized loss |  |
Unrealized losses | 249 | 532
Investment grade fixed income securities |  |
Other details of unrealized loss |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | 139 |
Unrealized losses | 155 | 344
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | 16 |
Equity securities |  |
Other details of unrealized loss |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | 34 |
Unrealized losses | 41 | 85
Below investment grade fixed income securities |  |
Other details of unrealized loss |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | 34 |
Unrealized losses | 53 | 103
Unrealized losses having loss of less than twenty percent, less than 12 months | 19 |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | 19 |
Unrealized losses related to securities with unrealized loss position greater than 20% of cost or amortized cost, unrealized loss position of 12 or more consecutive months | 7 |
Below Investment Grade Equity Securities |  |
Other details of unrealized loss |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | 7 |
Equity-method limited partnerships |  |
Other details of unrealized loss |  |
Limited partnership interests | 4,940 | 4,530
Carrying value |  |
Other details of unrealized loss |  |
Cost method limited partnerships | 1,269 | 1,282
Carrying value | Cost-method Investments |  |
Other details of unrealized loss |  |
Cost method limited partnerships | $ 1,270 | $ 1,280

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- Definition This item represents the excess of [amortized] cost over fair value of fixed income securities that have been in a loss position for twelve months or longer, and have unrealized loss position greater than 20% of cost or amortized cost for those securities which are categorized neither as held-to-maturity nor trading securities as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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