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Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned $ 4,444 $ 4,293
Securities sold under agreements to repurchase 1,316  
Total 5,760  
US Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities sold under agreements to repurchase 1,316  
Overnight and Open [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 4,444 4,293
Total 5,760  
Overnight and Open [Member] | US Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities sold under agreements to repurchase 1,316  
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 4,389 4,269
Common Stock [Member] | Overnight and Open [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 4,389 4,269
Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 55 24
Corporate Bonds [Member] | Overnight and Open [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned $ 55 $ 24