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Debt Obligations (Commercial Paper) (Details) - Commercial paper
9 Months Ended
Sep. 30, 2018
Short-term Debt [Line Items]  
Weighted average interest rate 2.45%
Minimum  
Short-term Debt [Line Items]  
Maturity period 7 days
Maximum  
Short-term Debt [Line Items]  
Maturity period 63 days
Weighted Average  
Short-term Debt [Line Items]  
Maturity period 29 days