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Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross |  | $ 589 | $ 493 |
Less: accumulated depreciation |  | (319) | (240) |
Total |  | 270 | 253 | [1]
Capitalized Software and Website Development |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross |  | 335 | 259 |
Total |  | 115 | 99 |
Building |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross | [2] |  | 123 |
Finance Lease Right-of-Use Asset |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross | [2] | 114 |  |
Leasehold Improvements |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross |  | 49 | 41 |
Computer Equipment and Purchased Software |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross |  | 70 | 52 |
Furniture, Office Equipment and Other |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, gross |  | $ 21 | $ 18 |
[1] | Refer to the below discussion regarding the transition accounting for operating and finance leases upon adoption of ASC 842.
[2] | Refer to “Note 2: Significant Accounting Policies,” regarding the transition accounting related to our adoption of ASC 842 and the subsequent accounting for our Headquarter Lease.

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