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Derivatives - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 14, 2018
USD ($)
instrument
Derivatives, Fair Value [Line Items]    
Purchased securities $ 3  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Number of derivative instruments | instrument   8
Notional amount   $ 25