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Investments (Gain of Realignment) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Gain of Realignment [Line Items] |  |
Cash | $ 4,818 |
Carrying Value of Dow Corning Equity Investment | (1,560) |
Carrying Value of HSG Equity Investment | (383) |
Other | (199) | [1]
Gain | 2,676 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Gain of Realignment [Line Items] |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 260 |
Foreign Currency Transaction Gain, before Tax | $ 45 |
[1] | Primarily consists of the release of accumulated other comprehensive income items related to unamortized actuarial losses related to Dow Corning's pension plan and foreign currency translation gains in the amounts of $260 million and $45 million, respectively.

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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