Debt Narrative (Details) $ in Millions	Feb. 23, 2018 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 23, 2018
Debt Instrument, Face Amount	$ 1,400
Proceeds from Debt, Net of Issuance Costs	1,338
Two Point Eight Percent due on March 1, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Maturity Date	Mar. 01, 2023
Debt Instrument, Interest Rate, Stated Percentage	2.80%
Three Point Two Five Percent due on March 1, 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Maturity Date	Mar. 01, 2028
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Three Point Five Five Percent due on March 1, 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Maturity Date	Mar. 01, 2038
Debt Instrument, Interest Rate, Stated Percentage	3.55%
Three Point Six Two Five Percent due on March 1, 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Maturity Date	Mar. 01, 2048
Debt Instrument, Interest Rate, Stated Percentage	3.625%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	na
Period Type:	instant

- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ 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(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	duration

- 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

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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Balance Type:	debit
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