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Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Loans And Allowance For Credit Losses [Abstract]    
Commercial $ 25 $ 49
Commercial real estate 9 51
Consumer 7 9
Outstanding balance 41 109
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net 27 77
ALLL 0 1
Carrying amount, net $ 27 $ 76