Advances and Other Receivables, Net - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Advances And Other Receivables, Reserves [Roll Forward]
Balance - beginning of period	$ 216	$ 98	$ 168	$ 47
Provision and other additions	13	35	72	102
Write-offs	(38)	(3)	(49)	(19)
Balance - end of period	191	130	191	130
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans	$ (7)	$ (18)	$ (20)	$ (46)