Investments - Equity Security Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Cost
Equity securities with readily determinable fair values	$ 257
Equity securities with no readily determinable fair value	270
Total	527
Equity securities with readily determinable fair values		$ 238
Equity securities with no readily determinable fair value		225
Total		463
Carrying Value
Equity securities with readily determinable fair values	207
Equity securities with no readily determinable fair value	396
Total	$ 603
Equity securities with readily determinable fair values		246
Equity securities with no readily determinable fair value		255
Total		$ 501