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Advances and Other Receivables - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Advances And Other Receivables, Reserves [Roll Forward]
Balance - beginning of period	$ 208	$ 168
Provision and other additions	15	30
Write-offs	(17)	(5)
Balance - end of period	206	193
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans	$ 12	$ 10