Summary of significant accounting policies.

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Amount, after allowance for credit loss, of accounts and financing receivable. Includes, but is not limited to, notes and loan receivable.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amortized cost, after allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 9,950
Guarantees carrying value	1,900		$ 1,450
Accounts receivable, net	3,782		4,418
MyPower customer notes receivable, net of allowance for credit losses	245		248
Financing receivable, net of allowance for credit losses, current	5		4
Allowance for credit losses	33		33
Government Rebates Receivables
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, net	232		315
Automotive sales
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue	3,600		3,600
Revenue recognized	258	$ 281
Financing receivable, Net	243		247
Automotive sales \| Other non-current assets
Summary Of Significant Accounting Policies [Line Items]
Financing receivable, Net	747		821
Automotive sales \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 780
Deferred revenue, expected to recognize period	12 months
Automotive regulatory credits
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 4,580
Automotive regulatory credits \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 1,460
Deferred revenue, expected to recognize period	12 months
Energy generation and storage segment
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,090		1,770
Revenue recognized	623	$ 417
Financing receivable, Net	35		34
Energy generation and storage segment \| Other non-current assets
Summary Of Significant Accounting Policies [Line Items]
Financing receivable, Net	668		$ 658
Energy generation and storage segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 4,710
Deferred revenue, expected to recognize period	12 months