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Investments (Schedule Of Other Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Cost-method Investments [Line Items]    
Other investments - Total $ 4,519 $ 3,291
Other Investments and Securities, at Cost 4,270 2,993
Fair Value    
Schedule of Cost-method Investments [Line Items]    
Investment Funds 251 269
Limited Partnerships 730 709
Investment Funds Limited Partnerships Partially Owned Investment Companies Total 2,645 1,498
Life Settlement Contracts, Fair Value Method, Face Value 248 222
Policy Loans Investments 209 184
Trading Securities 296 284
Other Other Investments 140 125
Other investments - Total 4,519 3,291
Cost    
Schedule of Cost-method Investments [Line Items]    
Investment Funds 126 138
Limited Partnerships 607 542
Investment Funds Limited Partnerships Partially Owned Investment Companies Total 2,645 1,498
Life Settlement Contracts, Fair Value Method, Face Value 248 222
Policy Loans Investments 209 184
Trading Securities 295 284
Other Other Investments 140 125
Other Investments and Securities, at Cost $ 4,270 $ 2,993