Summary of Short-Term Borrowings and Long-Term Debt (Parenthetical) (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
2.45% Senior notes due December 15, 2019
Debt Instrument [Line Items]
Interest rate of debt	2.45%	2.45%
Maturity date of debt	Dec. 15, 2019	Dec. 15, 2019
2.45% Senior notes due August 1, 2022
Debt Instrument [Line Items]
Interest rate of debt	2.45%	2.45%
Maturity date of debt	Aug. 01, 2022	Aug. 01, 2022
2.875% Senior notes due October 1, 2022
Debt Instrument [Line Items]
Interest rate of debt	2.875%	2.875%
Maturity date of debt	Oct. 01, 2022	Oct. 01, 2022
3.15% Senior notes due August 1, 2027
Debt Instrument [Line Items]
Interest rate of debt	3.15%	3.15%
Maturity date of debt	Aug. 01, 2027	Aug. 01, 2027
3.95% Senior notes due August 1, 2047
Debt Instrument [Line Items]
Interest rate of debt	3.95%	3.95%
Maturity date of debt	Aug. 01, 2047	Aug. 01, 2047
Floating Rate Senior notes due January 25, 2019
Debt Instrument [Line Items]
Maturity date of debt	Jan. 25, 2019	Jan. 25, 2019

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 820
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