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