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 | |||