XML 49 R37.htm IDEA: XBRL DOCUMENT v3.21.2
Investments (Schedule of Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investments [Abstract]    
Equity method $ 6,921 $ 6,006
Marketable equity securities 338 460
Nonmarketable equity securities 2,116 1,950
Other investments 131 143
Total investments 9,506 8,559
Less: Current investments 39 292
Less: Investment securing collateralized obligation 564 447
Noncurrent investments $ 8,903 $ 7,820