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Advances and Other Receivables - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Advances And Other Receivables, Reserves [Roll Forward] |  |  |  |
Balance - beginning of period | $ 191 | $ 216 | $ 208 | $ 168
Provision and other additions(1) | 18 | 13 | 59 | 72
Write-offs | (37) | (38) | (95) | (49)
Balance - end of period | 172 | 191 | 172 | 191
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | $ 8 | $ 7 | $ 28 | $ 20

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