Financial Instruments - Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Not designated as hedging instrument - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Equity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	[1]	$ (324)	$ 1,468
Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	[1]	39	806
Net gain from investment activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	[1]	$ (285)	$ 2,274

[1] Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment.