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Investments (Schedule Of Investments In Partially-Owned Insurance Companies) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Investment [Line Items] |  |
Carrying Value | $ 662 | $ 666
Issued Share Capital | 1,942 | 1,888
Huatai Group | CHINA |  |
Investment [Line Items] |  |
Carrying Value | 438 | 447
Issued Share Capital | $ 616 | $ 624
Ownership Percentage | 20.00% | 20.00%
Huatai Life Insurance Company | CHINA |  |
Investment [Line Items] |  |
Carrying Value | $ 105 | $ 99
Issued Share Capital | $ 495 | $ 428
Ownership Percentage | 20.00% | 20.00%
Freisenbruch-Meyer | Bermuda |  |
Investment [Line Items] |  |
Carrying Value | $ 9 | $ 8
Issued Share Capital | $ 0 | $ 5
Ownership Percentage | 40.00% | 40.00%
Russian Reinsurance Company | Russia |  |
Investment [Line Items] |  |
Carrying Value | $ 2 | $ 2
Issued Share Capital | $ 4 | $ 4
Ownership Percentage | 23.00% | 23.00%
ABR Reinsurance Capital Holdings Ltd. [Member] | Bermuda |  |
Investment [Line Items] |  |
Carrying Value | $ 93 | $ 97
Issued Share Capital | $ 800 | $ 800
Ownership Percentage | 11.00% | 11.00%
Chubb Arabia Cooperative Insurance Company [Member] | Saudi Arabia |  |
Investment [Line Items] |  |
Carrying Value | $ 15 | $ 13
Issued Share Capital | $ 27 | $ 27
Ownership Percentage | 30.00% | 30.00%

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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 + Details
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