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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

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