Severance and Retention Costs, Restructured North American TEGSEDI Operations (Details) - Restructured North American TEGSEDI Operations [Member] $ in Millions	Mar. 31, 2021 USD ($)
Minimum [Member]
Severance and Retention Costs [Abstract]
Total estimated expenses	$ 11
Maximum [Member]
Severance and Retention Costs [Abstract]
Total estimated expenses	$ 14