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, 2018	Dec. 31, 2017	Dec. 31, 2016
Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	$ 944	$ (2,039)	$ (1,659)
Equity contracts | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	603	(1,815)	(1,609)
Foreign exchange contracts | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	0	0	35
Credit contracts | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	129	(42)	44
Interest Rate Contract [Member] | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	0	0	(28)
Commodity contracts | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income	[1]	212	(182)	(101)
Investment Segment | Net gain (loss) from investment activities
Derivative [Line Items]
Derivative gain (loss) recognized in income		798	(1,969)	(1,640)
Energy Segment | Other Operating Income (Expense) [Member]
Derivative [Line Items]
Derivative gain (loss) recognized in income		$ 146	$ (70)	$ (19)

[1] Gains (losses) recognized on derivatives are classified in net gain from investment activities in our consolidated statements of operations for our Investment segment and are included in cost of goods sold for our Energy segment. Gains (losses) recognized on derivatives for our Investment segment were $798 million, $(1,969) million and $(1,640) million for the years ended December 31, 2018, 2017 and 2016, respectively. Gains (losses) recognized on derivatives for our Energy segment were $146 million, $(70) million and $(19) million for the years ended December 31, 2018, 2017 and 2016, respectively.