Organization and Significant Accounting Policies, Basis of Presentation (Details) - shares shares in Millions	3 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Jun. 30, 2017
Basis of Presentation [Abstract]
Additional shares of Akcea stock received for license of AKCEA-ANGPTL3-L	6.9	2.8
Akcea [Member]
Basis of Presentation [Abstract]
Percentage ownership	76.00%		100.00%
Akcea [Member] | Minimum [Member]
Basis of Presentation [Abstract]
Percentage ownership	68.00%
Akcea [Member] | Maximum [Member]
Basis of Presentation [Abstract]
Percentage ownership	77.00%