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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Not designated as hedging instrument - Net gain (loss) from investment activities - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	$ (2,039)	$ (1,659)	$ 705
Equity contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	(1,815)	(1,609)	(1)
Foreign exchange contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	0	35	160
Credit contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	(42)	44	489
Interest Rate Contract [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	0	(28)	0
Commodity contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	[1]	$ (182)	$ (101)	$ 57
[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 other income, net for all other segments.

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- Definition

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

+ References

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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- Definition

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