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Debt (Narrative) (Details) | Aug. 01, 2018 USD ($) Extension | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-term borrowings |  | $ 0 | $ 0
Accrued interest on long-term debt |  | 155,000,000 | 219,000,000
Reported Value Measurement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | 13,900,000,000 | 13,900,000,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | 14,200,000,000 | $ 15,300,000,000
Revolving Credit Facility [Member] | Revolving Credit Facility Due August 2023 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Agreement term | 5 years |  |
Credit line available under the agreement | $ 3,000,000,000 |  |
Number of extensions | Extension | 2 |  |
Extension term | 1 year |  |
Minimum consolidated EBITDA to interest expense | 4 |  |
Consolidated EBITDA to interest expense | 14.8 |  |
Revolving Credit Facility [Member] | Revolving Credit Facility Due August 2020 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Agreement term | 5 years |  |
Credit line available under the agreement | $ 3,000,000,000 |  |
LIBOR [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility Due August 2023 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Applicable interest | 1.00% |  |
Credit available under credit agreement |  | $ 3,000,000,000 |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within 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 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e7018-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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