Accounts and Notes Receivable and Credit Quality of Receivables - Components of Notes Receivable, Net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total accounts and notes receivable, net	$ 811	$ 753
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	198	178
Notes receivable allowance	(23)	(24)	$ (23)	$ (21)
Total accounts and notes receivable, net	175	154
Domestic | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	84	55
Notes receivable allowance	(5)	(6)
International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	114	123
Notes receivable allowance	(18)	(18)
Balances over 90 days past due | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	32	31
Notes receivable allowance for balances over 90 days past due	(23)	(24)
Notes receivable, net, balances over 90 days past due	9	7
Balances over 90 days past due | Domestic | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	13	6
Notes receivable allowance for balances over 90 days past due	(5)	(6)
Balances over 90 days past due | International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	19	25
Notes receivable allowance for balances over 90 days past due	$ (18)	$ (18)