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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 | 12 Months Ended
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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.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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