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Financial Instruments - Investments - Unrealized Gains and Losses Related to Equity Securities - Footnotes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net unrealized gains during the reporting period on equity securities still held at the reporting date | [1] | $ 40 | $ 370
Financial Assets and Liabilities [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net unrealized gains during the reporting period on equity securities still held at the reporting date |  | 8 | 344
Other equity securities [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net unrealized gains during the reporting period on equity securities still held at the reporting date |  | $ 32 | $ 26
[1] | The third quarter of 2018 includes $8 million of unrealized net gains in Other (income)/deductions––net reflecting the adoption of a new accounting standard in the first quarter of 2018 and $32 million of unrealized gains on other equity securities. The first nine months of 2018 includes $344 million of unrealized net gains in Other (income)/deductions––net reflecting the adoption of a new accounting standard in the first quarter of 2018 and $26 million of unrealized gains on other equity securities. For additional information, see Note 1B and Note 4.

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