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Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned $ 4,091 $ 4,444
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 4,091 4,444
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 4,039 4,389
Common Stock [Member] | Overnight and Open [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 4,039 4,389
Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned 52 55
Corporate Bonds [Member] | Overnight and Open [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities loaned $ 52 $ 55