Acquisition of subsidiaries (Tables)
|12 Months Ended|
Dec. 31, 2020
|Business Combinations [Abstract]|
|Acquisition of subsidiaries||
Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef