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Financial Instruments - Derivatives, Other Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 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