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Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Instruments, Gain (Loss) [Table Text Block]
 
Year Ended December 31, 2017
 
Year Ended December 31, 2016
 
Amount of derivative gain (loss) recognized/reclassified
(In millions)

OCI
 
Reclassified
from AOCI
to interest
income
 
Noninterest
income
(expense)
 
Offset to
interest
expense
 
OCI
 
Reclassified
from AOCI
to interest
income
 
Noninterest
income
(expense)
 
Offset to
interest
expense
Derivatives designated as hedging instruments
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash flow hedges: 1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
$
(8
)
 
$
4

 
 
 
 
 
$
8

 
$
11

 
 
 
 
Derivatives not designated as hedging instruments
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
 
 
 
 
$
(1
)
 
 
 
 
 
 
 
$
1

 
 
Interest rate swaps for customers
 
 
 
 
11

 
 
 
 
 
 
 
14

 
 
Foreign exchange
 
 
 
 
17

 
 
 
 
 
 
 
11

 
 
Total derivatives
$
(8
)
 
$
4

 
$
27

 
$
—

 
$
8

 
$
11

 
$
26

 
$
—

Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts.
1 
Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following December 31, 2017, we estimate that $1 million will be reclassified from AOCI into interest income.
    
Total net gains (losses) included in, Other noninterest expense $ 223 $ 213 $ 225
Servicing Contracts [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance 20 14  
Total net gains (losses) included in, Equity securities gains, net 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income (1) 6  
Total net gains (losses) included in, Purchases 0 0  
Total net gains (losses) included in, Redemptions and paydowns 1 0  
Fair value of assets, Ending balance 18 20 14
Private Equity Investments [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance 73 58  
Total net gains (losses) included in, Equity securities gains, net 7 6  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income 0 0  
Total net gains (losses) included in, Purchases 20 10  
Total net gains (losses) included in, Redemptions and paydowns 5 1  
Fair value of assets, Ending balance $ 95 $ 73 $ 58