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Investments (Schedule Of Components Of Restricted Assets) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Trust funds $ 10,554 $ 11,315
Deposits with non-U.S. regulatory authorities 1,969 1,970
Assets pledged under repurchase agreements 1,451 1,435
Deposits with U.S. regulatory authorities 1,336 1,334
Other pledged assets 459 391
Total restricted assets $ 15,769 $ 16,445