Investments - Investment Segment - Ownership (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Summary of Investment Holdings [Line Items]
Fair value of investments	$ 2,971		$ 2,971			$ 3,137
Gains (Losses) Recognized in Income	$ 868	$ (66)	$ (577)	$ (113)
Herbalife
Summary of Investment Holdings [Line Items]
Voting Interests	23.80%		23.80%
Fair value of investments	$ 1,585		$ 1,585			1,343
Gains (Losses) Recognized in Income	$ 557	(288)	$ 42	(456)
Hertz
Summary of Investment Holdings [Line Items]
Voting Interests	0.00%		0.00%		38.90%
Fair value of investments						551
Gains (Losses) Recognized in Income	$ (302)	(27)	$ (637)	68
Caesars
Summary of Investment Holdings [Line Items]
Voting Interests	16.70%		16.70%
Fair value of investments	$ 1,386		$ 1,386			$ 1,243
Gains (Losses) Recognized in Income	$ 613	$ 249	$ 18	$ 275