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Financial Instruments - Derivatives, Other Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
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