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Derivative Financial Instruments - Other Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Financial Instruments      
Gains (losses) excluded from the assessment of hedge effectiveness for fair value hedges
Gains (losses) excluded from the assessment of hedge effectiveness for cash flow hedges
Gains (losses) associated with underlying exposure that did not occur or was not expected to occur for cash flow hedges