Acquisitions Investments (Details) - Huatai Group [Member] - CHINA - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2019
Investment Holdings [Line Items]
Equity Method Investment, Ownership Percentage	47.10%
Equity method investment, additional 7.1 percentage agreed on		7.10%
Equity method investment, incremental 0.9 percent obtained	0.90%
Purchase of incremental ownership interest	$ 65