Advances and Other Receivables - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Advances And Other Receivables, Reserves [Roll Forward]
Balance - beginning of period	$ 206	$ 193	$ 208	$ 168
Provision and other additions(1)	26	29	41	59
Write-offs	(41)	(6)	(58)	(11)
Balance - end of period	191	216	191	216
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans	$ 8	$ 3	$ 20	$ 13