XML 180 R72.htm IDEA: XBRL DOCUMENT v3.20.1
Investments - Schedule of Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]    
Equity method investments $ 1,107 $ 1,862
Private equity investments 95 323
Other 8 4
Investments $ 1,210 $ 2,189