Advances and Other Receivables - Advances and Other Receivables Roll Forward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Advances And Other Receivables, Reserves [Roll Forward]
Balance - beginning of year	$ 168	$ 175	$ 47
Provision and other additions	108		160
Write-offs	(68)		(32)
Balance - end of year	$ 208	208	175
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans		$ (28)	$ (62)
Cumulative Effect, Period of Adoption, Adjustment | Reserves for Advances and Other Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ 7