Debt - Summary of Debt and Finance Leases (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Current	$ 2,115	$ 1,975
Long-Term	5,275	2,682
Unpaid Principal Balance	7,415	4,683
Unused Committed Amount	5,000	5,028
Less: Current portion	176	398
Long-term portion of lease obligations	130	175
Current portion of debt and finance leases	2,291	2,373
Long-term portion of debt and finance leases	5,405	2,857
Recourse debt:
Debt Instrument [Line Items]
Current	8	37
Long-Term	3	7
Unpaid Principal Balance	11	44
Unused Committed Amount	$ 5,000	5,028
Recourse debt: | 2024 Notes
Debt Instrument [Line Items]
Current		37
Long-Term		0
Unpaid Principal Balance		37
Unused Committed Amount		$ 0
Contractual Interest Rates	2.00%	2.00%
Contractual Maturity Date		2024-05
Recourse debt: | RCF Credit Agreement
Debt Instrument [Line Items]
Current	$ 0	$ 0
Long-Term	0	0
Unpaid Principal Balance	0	0
Unused Committed Amount	$ 5,000	$ 5,000
Contractual Maturity Date	2028-01	2028-01
Recourse debt: | Other
Debt Instrument [Line Items]
Current	$ 8	$ 0
Long-Term	3	7
Unpaid Principal Balance	11	7
Unused Committed Amount	$ 0	$ 28
Contractual Maturity Date, Start	2025-03	2025-03
Contractual Maturity Date, End	2031-01	2031-01
Recourse debt: | Other | Minimum
Debt Instrument [Line Items]
Contractual Interest Rates	3.96%	4.70%
Recourse debt: | Other | Maximum
Debt Instrument [Line Items]
Contractual Interest Rates	5.75%	5.75%
Non-recourse debt:
Debt Instrument [Line Items]
Current	$ 2,107	$ 1,938
Long-Term	5,272	2,675
Unpaid Principal Balance	7,404	4,639
Unused Committed Amount	0	0
Non-recourse debt: | Automotive Asset-backed Notes
Debt Instrument [Line Items]
Current	2,073	1,906
Long-Term	2,107	2,337
Unpaid Principal Balance	4,195	4,259
Unused Committed Amount	$ 0	$ 0
Contractual Maturity Date, Start	2025-08	2024-07
Contractual Maturity Date, End	2035-06	2031-05
Non-recourse debt: | Automotive Asset-backed Notes | Minimum
Debt Instrument [Line Items]
Contractual Interest Rates	3.95%	0.60%
Non-recourse debt: | Automotive Asset-backed Notes | Maximum
Debt Instrument [Line Items]
Contractual Interest Rates	6.57%	6.57%
Non-recourse debt: | China Working Capital Facility
Debt Instrument [Line Items]
Current	$ 0
Long-Term	2,851
Unpaid Principal Balance	2,851
Unused Committed Amount	$ 0
Contractual Interest Rates	2.27%
Contractual Maturity Date	2025-04
Non-recourse debt: | Cash Equity Debt
Debt Instrument [Line Items]
Current	$ 30	$ 28
Long-Term	309	330
Unpaid Principal Balance	348	367
Unused Committed Amount	$ 0	$ 0
Contractual Maturity Date, Start	2033-07	2033-07
Contractual Maturity Date, End	2035-01	2035-01
Non-recourse debt: | Cash Equity Debt | Minimum
Debt Instrument [Line Items]
Contractual Interest Rates	5.25%	5.25%
Non-recourse debt: | Cash Equity Debt | Maximum
Debt Instrument [Line Items]
Contractual Interest Rates	5.81%	5.81%
Non-recourse debt: | Solar Asset-backed Notes
Debt Instrument [Line Items]
Current	$ 4	$ 4
Long-Term	5	8
Unpaid Principal Balance	10	13
Unused Committed Amount	$ 0	$ 0
Contractual Interest Rates	4.80%	4.80%
Contractual Maturity Date	2026-12	2026-12