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Financial Instruments - Short-term Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Financial Instruments [Abstract] |  |  |
Commercial paper |  | $ 2,600 | $ 6,100
Current portion of long-term debt, principal amount |  | 4,260 | 3,532
Other short-term borrowings, principal amount | [1] | 537 | 320
Total short-term borrowings, principal amount |  | 7,396 | 9,951
Net fair value adjustments related to hedging and purchase accounting |  | (5) | 14
Net unamortized discounts, premiums and debt issuance costs |  | (7) | (12)
Total Short-term borrowings, including current portion of long-term debt, carried at historical proceeds, as adjusted | [2] | $ 7,385 | $ 9,953
[1] | Other short-term borrowings primarily include cash collateral. For additional information, see Note 7F.
[2] | Amounts may not add due to rounding.

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- Definition Debt Instrument, Fair Value Adjustments, Hedging and Purchase Accounting + References No definition available. + Details
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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition Long-term Debt, Current Maturities, Excluding Net Fair Value Adjustments Related To Hedging And Purchase Accounting + References No definition available. + Details
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- Definition Short-term Debt, Gross + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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