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Advances and Other Receivables - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Advances And Other Receivables, Reserves [Roll Forward] |  |  |  |
Balance - beginning of year | $ 168 | $ 175 | $ 47 |
Provision and other additions | 108 |  | 160 |
Write-offs | (68) |  | (32) |
Balance - end of year | $ 208 | 208 | 175 |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans |  | $ (28) | $ (62) |
Cumulative Effect, Period of Adoption, Adjustment | Reserves for Advances and Other Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses |  |  |  | $ 7

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