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Financing Arrangements - Credit Facilities (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Mar. 01, 2016 USD ($)
Other borrowings |  |  |  |
Financing Arrangements |  |  |  |
Amount outstanding under credit facilities |  |  | $ 1,700,000,000 |
Revolving Credit Facility |  |  |  |
Financing Arrangements |  |  |  |
Maximum borrowing capacity | € |  | € 125,000,000 |  |
Committed credit line | Other borrowings |  |  |  |
Financing Arrangements |  |  |  |
Maximum borrowing capacity |  |  | 3,500,000,000 |
Committed credit line | Other borrowings | $1.7 billion Revolving Loan and Letter of Credit Facility |  |  |  |
Financing Arrangements |  |  |  |
Maximum borrowing capacity |  |  | 1,700,000,000 | $ 1,700,000,000
Maximum borrowing capacity additional amount, subject to certain conditions | $ 500,000,000 |  |  |
Committed credit line | Other borrowings | $1.7 billion Revolving Loan and Letter of Credit Facility | Maximum |  |  |  |
Financing Arrangements |  |  |  |
Ratio of consolidated debt to tangible net worth (as a percent) | 100.00% |  |  |
Committed credit line | Other borrowings | $1.7 billion Revolving Loan and Letter of Credit Facility | Maximum | Subsidiaries |  |  |  |
Financing Arrangements |  |  |  |
Aggregate amount of debt |  | 750,000,000 | 750,000,000 |
Committed credit line | Other borrowings | $1.8 billion Revolving Loan and Letter of Credit Facility |  |  |  |
Financing Arrangements |  |  |  |
Maximum borrowing capacity |  |  | 1,800,000,000 |
Maximum borrowing capacity additional amount, subject to certain conditions | $ 500,000,000 |  |  |
Committed credit line | Other borrowings | $1.8 billion Revolving Loan and Letter of Credit Facility | Maximum |  |  |  |
Financing Arrangements |  |  |  |
Ratio of consolidated debt to tangible net worth (as a percent) | 100.00% |  |  |
Committed credit line | Other borrowings | $1.8 billion Revolving Loan and Letter of Credit Facility | Maximum | Subsidiaries |  |  |  |
Financing Arrangements |  |  |  |
Aggregate amount of debt |  | € 750,000,000 | 750,000,000 |
Committed credit line | Revolving Credit Facility |  |  |  |
Financing Arrangements |  |  |  |
Maximum borrowing capacity |  |  | $ 1,750,000,000 |

X
- Definition Represents the ratio of consolidated debt to tangible net worth allowed under the financial covenants of the credit facility. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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 carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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