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Debt Obligations (Commercial Paper) (Details) - Commercial paper
12 Months Ended
Dec. 31, 2018
Short-term Debt [Line Items]  
Weighted average interest rate 3.03%
Minimum  
Short-term Debt [Line Items]  
Maturity period 24 days
Maximum  
Short-term Debt [Line Items]  
Maturity period 67 days
Weighted Average  
Short-term Debt [Line Items]  
Maturity period 33 days