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Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments:
$ in Millions
Jun. 30, 2017
USD ($)
Interest rate swaps  
Notional Disclosures  
Notional amount of interest rate swaps $ 500
Derivative expiring in 2018  
Notional Disclosures  
Notional amount of interest rate swaps 300
Derivative expiring in 2019  
Notional Disclosures  
Notional amount of interest rate swaps 100
Derivative expiring in 2020  
Notional Disclosures  
Notional amount of interest rate swaps $ 100