v3.19.3.a.u2
Supplemental Financial Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Investments    
Unrealized gain   $ 50
Cephea Valve Technologies, Inc    
Business acquisition    
Research & development (R&D) asset $ 102  
Research & development expense $ 102