Accounts Receivable and Notes Receivable and Credit Quality of Receivables - Components of Total Notes Receivable, Net (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Notes receivable, net
Total accounts and notes receivable, net	$ 808	$ 753
Notes Receivable
Notes receivable, net
Notes receivable	176	178
Notes receivable allowance for doubtful accounts	(17)	(24)	$ (21)
Total accounts and notes receivable, net	159	154
Domestic | Notes Receivable
Notes receivable, net
Notes receivable	79	55
Notes receivable allowance for doubtful accounts	(2)	(6)
International | Notes Receivable
Notes receivable, net
Notes receivable	97	123
Notes receivable allowance for doubtful accounts	(15)	(18)
Balances over 90 days past due | Notes Receivable
Balances over 90 days past due
Notes receivable, balances over 90 days past due	30	31
Notes receivable allowance for doubtful accounts, balances over 90 days past due	(17)	(24)
Notes receivable, net, balances over 90 days past due	13	7
Balances over 90 days past due | Domestic | Notes Receivable
Balances over 90 days past due
Notes receivable, balances over 90 days past due	12	6
Notes receivable allowance for doubtful accounts, balances over 90 days past due	(2)	(6)
Balances over 90 days past due | International | Notes Receivable
Balances over 90 days past due
Notes receivable, balances over 90 days past due	18	25
Notes receivable allowance for doubtful accounts, balances over 90 days past due	$ (15)	$ (18)