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Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Trust funds $ 11,085 $ 10,838
Deposits with non-U.S. regulatory authorities 2,263 2,305
Assets pledged under repurchase agreements 1,458 1,431
Deposits with U.S. regulatory authorities 1,327 1,345
Other pledged assets 398 457
Total restricted assets $ 16,531 $ 16,376