Subsequent Events (Details) - Senior Notes [Member] - Subsequent Event [Member]	Jul. 23, 2019 USD ($)
600 Million Senior Note Maturity July 22, 2022 [Member]
Subsequent Event [Line Items]
Debt Issued	$ 600,000,000
Debt instrument, maturity date	Jul. 22, 2022
Interest rate	2.232%
600 Million Senior Note Maturity July 22, 2022 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Variable rate basis	3-month LIBOR rate
Basis spread on variable rate	0.44%
900 Million Senior Note Maturing July 22, 2022 [Member]
Subsequent Event [Line Items]
Debt Issued	$ 900,000,000
Debt instrument, maturity date	Jul. 22, 2022
900 Million Senior Note Maturing July 22, 2022 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Variable rate basis	3-month LIBOR rate
Basis spread on variable rate	0.45%
1 Billion Senior Note Maturity July 23, 2036 [Member] \| Parent Company [Member]
Subsequent Event [Line Items]
Debt Issued	$ 1,000,000,000.0
Debt instrument, maturity date	Jul. 23, 2026
Interest rate	2.60%

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

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

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

+ References

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

+ 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/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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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