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Commitments and Contingencies (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]      
Rent expense $ 208,000,000 $ 203,000,000 $ 187,000,000
Standby letters of credit [Member]
     
Commitments and Contingencies Disclosure [Line Items]      
Aggregate face amount of letter of credit agreements 240,000,000    
Bond Market Fund Litigation [Member]
     
Commitments and Contingencies Disclosure [Line Items]      
Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote 25.00%    
Margin Requirements [Member]
     
Commitments and Contingencies Disclosure [Line Items]      
Funds drawn under LOC's $ 0