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Equity - Capped Calls (Details) - Call Option - USD ($) shares in Millions	1 Months Ended
	Dec. 20, 2017	Nov. 30, 2017
Subsequent Event
Option Indexed to Issuer's Equity [Line Items]
Treasury shares acquired from settlement of capped calls (in shares)	5
Purchased options | Subsequent Event
Option Indexed to Issuer's Equity [Line Items]
Shares received upon settlement of capped calls	5
Dollar value of shares received upon settlement of capped calls	$ 215,000,000
Purchased options | Minimum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration		$ 0
Purchased options | Maximum
Option Indexed to Issuer's Equity [Line Items]
Value at Expiration		$ 527,000,000

X

- Definition

Upon expiration of an option indexed to issuer's equity, the amount of value that could be received.

+ References

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- Definition

Fair value of shares received from settlement of options indexed to issuers equity.

+ References

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- Definition

Upon share-settlement of options indexed to issuer's equity, the number of shares received.

+ References

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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.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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