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Financial Instruments and Risk Management (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Number of days from period end | 2 days |  |
Debt, Long-term and Short-term, Combined Amount | $ 10,457 | $ 10,457 |
Foreign Currency Derivatives [Abstract] |  |  |
Maximum term of currency derivative instruments (in years) |  | 1 year |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | 10,400 | $ 10,400 | $ 10,400
Estimate of Fair Value, Fair Value Disclosure |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total debt | 10,876 | 10,876 | 12,457
Estimate of Fair Value, Fair Value Disclosure | Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total debt | 0 | 0 | 0
Estimate of Fair Value, Fair Value Disclosure | Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total debt | 6,726 | 6,726 | 3,285
Estimate of Fair Value, Fair Value Disclosure | Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total debt | 4,150 | 4,150 | 9,172
Carrying (Reported) Amount, Fair Value Disclosure |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  | 10,942
Foreign Exchange Contract [Member] | Other current assets | Level 2 |  |  |
Foreign Currency Derivatives [Abstract] |  |  |
Derivative, Notional Amount | 591 | 591 | 633
Foreign Exchange Contract [Member] | Other assets | Level 2 |  |  |
Foreign Currency Derivatives [Abstract] |  |  |
Derivative, Notional Amount | $ 100 | $ 100 | $ 100

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- Definition This item represents the maximum expiration date for currency derivative instruments. + References No definition available. + Details
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- Definition Number of days from period end used when calculating fair value. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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