Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Not designated as hedging instrument - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net gain (loss) from investment activities
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	$ (495)	$ (2,502)	$ 798
Equity Contract [Member]
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	(1,583)	(2,152)	603
Credit Risk Contract [Member]
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	$ 1,088	(342)	129
Commodity Contract [Member]
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]		$ (8)	$ 66

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