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Derivative and Financial Instruments - Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and cash equivalents | $ 3,716 | $ 6,325
Short-term Investments | 875 | 1,873
Cash [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and cash equivalents | 511 | 948
Time Deposits [Member] | Remaining maturities from 1 to 90 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and cash equivalents | 2,966 | 5,004
Short-term Investments | 104 | 821
Commercial Paper [Member] | Remaining maturities from 1 to 90 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and cash equivalents | 239 | 373
Short-term Investments | 771 | 978
Commercial Paper [Member] | Remaining maturities from 91 to 180 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | $ 0 | $ 74

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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