Receivables, Allowance for Credit Losses and Credit Quality of Receivables - Components of Notes Receivable, Net (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	$ 25		$ 25
Notes receivable allowance		$ (86)		$ (42)
Long-term receivables, net	641		636
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	725	722
Notes receivable allowance	(84)	(86)	$ (70)
Long-term receivables, net	641	636
UNITED STATES | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	478	443
Notes receivable allowance	(42)	(43)
International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable allowance		(43)
International [Member] | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	247	279
Notes receivable allowance	(42)	(43)
Balances Over 90 days Past Due | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	146	140
Notes receivable allowance for balances over 90 days past due	(48)	(50)
Notes receivable, net, balances over 90 days past due	98	90
Balances Over 90 days Past Due | UNITED STATES | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	96	88
Notes receivable allowance for balances over 90 days past due	(25)	(26)
Balances Over 90 days Past Due | International [Member] | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	50	52
Notes receivable allowance for balances over 90 days past due	$ (23)	$ (24)