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Derivatives and Risk Management (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
item
Derivative [Line Items]  
Number of derivative positions designated for hedge accounting | item 0
Interest Rate Swaps [Member]  
Derivative [Line Items]  
Derivative assets $ 1
Not Designated as Hedging Instrument [Member]  
Derivative [Line Items]  
Derivative assets 20
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]  
Derivative [Line Items]  
Notional amount $ 170
Derivative, expiration Jun. 30, 2020
Derivative assets $ 1