Acquisitions, Disposals and Other Transactions - Schedule of Total Fair Value of iProperty at Acquisition Date (Detail) - iProperty Group Limited [Member] $ in Millions	1 Months Ended
Feb. 29, 2016 USD ($)
Business Acquisition [Line Items]
Cash paid for iProperty equity	$ 340
Deferred consideration	76
Total consideration	416
The fair value of the previously held equity investment subsequent to step acquisition remeasurement	120
Total fair value	$ 536

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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.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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- Definition

Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6516133

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