Fair Value (Quantitative Information) (Details) - Measurement Input, Entity Credit Risk [Member] - Interest Rate Contract	12 Months Ended
	Dec. 31, 2018
Minimum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Measurement Inputs, Nonrecurring	2.00%
Maximum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Measurement Inputs, Nonrecurring	5.00%
Weighted Average
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Measurement Inputs, Nonrecurring	4.00%