Short-Term Borrowings and Borrowing Arrangements (Details)	12 Months Ended
Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Short-term Debt [Line Items]
Short-term borrowings	$ 0	$ 0
Ratio of debt to consolidated EBITDA	1.3
Ratio of consolidated EBITDA to consolidated interest expense	14.8
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Credit line available under the credit agreement	$ 3,000,000,000
Term of debt	5 years
Maximum borrowing capacity	$ 3,000,000,000
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Short-term Debt [Line Items]
Ratio of debt to consolidated EBITDA	3
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Short-term Debt [Line Items]
Ratio of consolidated EBITDA to consolidated interest expense	4
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Interest rate for borrowing	1.125%

Line of Credit Facility, Covenant Terms, Debt to EBITDA Ratio

No definition available.

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- Definition

Line of Credit Facility, Covenant Terms, EBITDA to Interest Expense Ratio

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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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

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

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ 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)(a))
-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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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