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Segment Information and Revenue - Depreciation and Amortization Expense and Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense			$ 121	$ 88
Share-based compensation expense			341	231
Homes | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	$ 0	$ 3	2	8
Share-based compensation expense	1	11	14	29
IMT | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	32	23	104	68
Share-based compensation expense	123	50	263	150
Mortgages segment | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	2	2	8	5
Share-based compensation expense	$ 23	$ 9	$ 46	$ 25

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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- Definition

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+ References

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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