v3.20.4
Debt - Summary of Debt and Finance Lease (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 1,758 $ 1,399
Net Carrying Value, Long-Term 8,462 10,402
Unpaid Principal Balance 10,569 12,492
Unused Committed Amount 2,632 2,980
Net Carrying Value Finance leases, Current 374 386
Net Carrying Value Finance leases, Long-Term 1,094 1,232
Current portion of debt and finance leases 2,132 1,785
Net Carrying Value Total debt and finance leases, Long-Term 9,556 $ 11,634
2024 Notes [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates   2.00%
5.30% Senior Notes due in 2025 ("2025 Notes") [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Long-Term 1,785 $ 1,782
Solar asset-backed notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Long-Term 1,115 1,155
Solar Loan-backed Notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Long-Term 146 175
Recourse debt [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current 709 253
Net Carrying Value, Long-Term 4,951 7,010
Unpaid Principal Balance 5,957 7,898
Unused Committed Amount 278 499
Recourse debt [Member] | 1.25% Convertible Senior Notes due in 2021 ("2021 Notes") [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current 419  
Net Carrying Value, Long-Term   1,304
Unpaid Principal Balance $ 422 $ 1,380
Contractual Interest Rates 1.25% 1.25%
Contractual Maturity Date 2021-03 2021-03
Recourse debt [Member] | 2.375% Convertible Senior Notes due in 2022 [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 115  
Net Carrying Value, Long-Term 366 $ 902
Unpaid Principal Balance $ 503 $ 978
Contractual Interest Rates 2.375% 2.375%
Contractual Maturity Date 2022-03 2022-03
Current portion of debt and finance leases $ 115  
Net Carrying Value Total debt and finance leases, Long-Term (115)  
Recourse debt [Member] | 2024 Notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current 171  
Net Carrying Value, Long-Term 856 $ 1,383
Unpaid Principal Balance $ 1,282 $ 1,840
Contractual Interest Rates 2.00% 2.00%
Contractual Maturity Date 2024-05 2024-05
Current portion of debt and finance leases $ 171  
Net Carrying Value Total debt and finance leases, Long-Term (171)  
Recourse debt [Member] | 5.30% Senior Notes due in 2025 ("2025 Notes") [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Long-Term 1,785 $ 1,782
Unpaid Principal Balance $ 1,800 $ 1,800
Contractual Interest Rates 5.30% 5.30%
Contractual Maturity Date 2025-08 2025-08
Recourse debt [Member] | Credit Agreement [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current   $ 141
Net Carrying Value, Long-Term $ 1,895 1,586
Unpaid Principal Balance 1,895 1,727
Unused Committed Amount $ 278 $ 499
Contractual Interest Rates 3.30%  
Contractual Maturity Date 2023-07  
Contractual Maturity Date, Start   2020-06
Contractual Maturity Date, End   2023-07
Recourse debt [Member] | Credit Agreement [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates   2.70%
Recourse debt [Member] | Credit Agreement [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates   4.80%
Recourse debt [Member] | Solar Bonds and other Loans [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 4 $ 15
Net Carrying Value, Long-Term 49 53
Unpaid Principal Balance $ 55 $ 70
Contractual Maturity Date, Start 2021-01 2020-03
Contractual Maturity Date, End 2031-01 2031-01
Recourse debt [Member] | Solar Bonds and other Loans [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 3.60% 3.60%
Recourse debt [Member] | Solar Bonds and other Loans [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 5.80% 5.80%
Recourse debt [Member] | Zero-Coupon Convertible Senior Notes due in 2020 [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current   $ 97
Unpaid Principal Balance   $ 103
Contractual Interest Rates 0.00% 0.00%
Contractual Maturity Date   2020-12
Non-recourse debt [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 1,049 $ 1,146
Net Carrying Value, Long-Term 3,511 3,392
Unpaid Principal Balance 4,612 4,594
Unused Committed Amount 2,354 2,481
Non-recourse debt [Member] | Automotive Asset-backed Notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current 777 573
Net Carrying Value, Long-Term 921 997
Unpaid Principal Balance $ 1,705 $ 1,577
Contractual Maturity Date, Start 2021-08 2020-02
Contractual Maturity Date, End 2024-08 2023-05
Non-recourse debt [Member] | Automotive Asset-backed Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 0.60% 0.20%
Non-recourse debt [Member] | Automotive Asset-backed Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 7.90% 7.90%
Non-recourse debt [Member] | Solar asset-backed notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 39 $ 32
Net Carrying Value, Long-Term 1,076 1,123
Unpaid Principal Balance $ 1,141 $ 1,183
Contractual Maturity Date, Start 2024-09 2024-09
Contractual Maturity Date, End 2048-02 2048-02
Non-recourse debt [Member] | Solar asset-backed notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 3.00% 4.00%
Non-recourse debt [Member] | Solar asset-backed notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 7.70% 7.70%
Non-recourse debt [Member] | China Loan Agreements [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current   $ 444
Net Carrying Value, Long-Term $ 616 297
Unpaid Principal Balance 616 741
Unused Committed Amount $ 1,372 $ 1,542
Contractual Interest Rates 4.00%  
Contractual Maturity Date, Start 2021-06 2020-09
Contractual Maturity Date, End 2024-12 2024-12
Non-recourse debt [Member] | China Loan Agreements [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates   3.70%
Non-recourse debt [Member] | China Loan Agreements [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates   4.00%
Non-recourse debt [Member] | Cash Equity Debt [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 18 $ 10
Net Carrying Value, Long-Term 408 430
Unpaid Principal Balance $ 439 $ 454
Contractual Maturity Date, Start 2033-07 2033-07
Contractual Maturity Date, End 2035-01 2035-01
Non-recourse debt [Member] | Cash Equity Debt [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 5.30% 5.30%
Non-recourse debt [Member] | Cash Equity Debt [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 5.80% 5.80%
Non-recourse debt [Member] | Solar Loan-backed Notes [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 13 $ 11
Net Carrying Value, Long-Term 133 164
Unpaid Principal Balance $ 152 $ 182
Contractual Maturity Date, Start 2048-09 2048-09
Contractual Maturity Date, End 2049-09 2049-09
Non-recourse debt [Member] | Solar Loan-backed Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 4.80% 4.80%
Non-recourse debt [Member] | Solar Loan-backed Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 7.50% 7.50%
Non-recourse debt [Member] | Warehouse Agreements [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 37 $ 21
Net Carrying Value, Long-Term 257 146
Unpaid Principal Balance 294 167
Unused Committed Amount $ 806 $ 933
Contractual Maturity Date 2022-09 2021-09
Non-recourse debt [Member] | Warehouse Agreements [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 1.70% 3.10%
Non-recourse debt [Member] | Warehouse Agreements [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 1.80% 3.60%
Non-recourse debt [Member] | Solar Term Loan [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 151 $ 8
Net Carrying Value, Long-Term   152
Unpaid Principal Balance $ 151 $ 161
Contractual Interest Rates 3.70% 5.40%
Contractual Maturity Date 2021-01 2021-01
Non-recourse debt [Member] | Automotive Lease-backed Credit Facilities [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current $ 14 $ 24
Net Carrying Value, Long-Term 19 16
Unpaid Principal Balance 33 $ 40
Unused Committed Amount $ 153  
Contractual Maturity Date   2022-11
Contractual Maturity Date, Start 2022-09  
Contractual Maturity Date, End 2022-11  
Non-recourse debt [Member] | Automotive Lease-backed Credit Facilities [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 1.90% 4.20%
Non-recourse debt [Member] | Automotive Lease-backed Credit Facilities [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 5.90% 5.90%
Non-recourse debt [Member] | Solar Revolving Credit Facility and Other Loans [Member]    
Debt Instrument [Line Items]    
Net Carrying Value, Current   $ 23
Net Carrying Value, Long-Term $ 81 67
Unpaid Principal Balance 81 89
Unused Committed Amount $ 23 $ 6
Contractual Maturity Date, Start 2022-06 2020-03
Contractual Maturity Date, End 2033-02 2022-06
Non-recourse debt [Member] | Solar Revolving Credit Facility and Other Loans [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 2.70% 4.50%
Non-recourse debt [Member] | Solar Revolving Credit Facility and Other Loans [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Contractual Interest Rates 5.10% 7.40%