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Investments (Schedule Of Other Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]    
Other investments - Total at Fair Value $ 3,291 $ 3,346
Other investments - Total at Cost 2,993 2,999
Fair Value    
Schedule of Cost-method Investments [Line Items]    
Investment funds 269 378
Limited partnerships 709 691
Partially owned investment companies 1,498 1,492
Life insurance policies 222 205
Policy loans 184 187
Trading securities 284 290
Other 125 103
Other investments - Total at Fair Value 3,291 3,346
Cost    
Schedule of Cost-method Investments [Line Items]    
Investment funds 138 228
Limited partnerships 542 497
Partially owned investment companies 1,498 1,492
Life insurance policies 222 205
Policy loans 184 187
Trading securities 284 287
Other 125 103
Other investments - Total at Cost $ 2,993 $ 2,999