Financial Instruments - Derivatives, Other Information (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 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 | ||||