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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Not designated as hedging instrument - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net gain from investment activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	$ (534)	$ (385)	$ (456)	$ (1,253)
Net gain from investment activities | Equity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	(564)	(350)	(653)	(1,185)
Net gain from investment activities | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	12	(15)	65	(32)
Net gain from investment activities | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	18	(20)	132	(36)
Investment Segment | Net gain from investment activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	(539)	(368)	(531)	(1,248)
Other Segments | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income	[1]	$ 5	$ (17)	$ 75	$ (5)
[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 and are included in other income (loss), net for all other segments. Gains (losses) recognized on derivatives for our Investment segment were $(539) million and $(368) million for the three months ended September 30, 2018 and 2017, respectively, and $(531) million and $(1,248) million for the nine months ended September 30, 2018 and 2017, respectively. Gains (losses) recognized on derivatives for our other segments were $5 million and $(17) million for the three months ended September 30, 2018 and 2017, respectively, and $75 million and $(5) million for the nine months ended September 30, 2018 and 2017, respectively.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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