Accounts and Notes Receivable and Credit Quality of Receivables - Components of Notes Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	$ 46			$ 53
Notes receivable allowance	(82)	$ (70)	$ (42)	(36)	$ (38)	$ (40)
Long-term receivables, net	650			$ 808
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	732		844
Notes receivable allowance	(82)		(36)
Long-term receivables, net	650		808
UNITED STATES | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	441		534
Notes receivable allowance	(37)		(13)
International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable allowance	(44)	$ (41)	(28)
International [Member] | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	291		310
Notes receivable allowance	(45)		(23)
Balances Over 90 days Past Due | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	180		120
Notes receivable allowance for balances over 90 days past due	(63)		(31)
Notes receivable, net, balances over 90 days past due	117		89
Balances Over 90 days Past Due | UNITED STATES | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	109		65
Notes receivable allowance for balances over 90 days past due	(27)		(8)
Balances Over 90 days Past Due | International [Member] | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable over 90 days past due	71		55
Notes receivable allowance for balances over 90 days past due	$ (36)		$ (23)