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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Summary of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 10,050
Guarantees carrying value	4,070		$ 3,450
MyPower
Summary of Significant Accounting Policies [Line Items]
MyPower customer notes receivable, net of allowance for credit losses	240		241
Allowance for credit losses	18		26
Automotive sales
Summary of Significant Accounting Policies [Line Items]
Deferred revenue	4,050		3,870
Revenue recognized	468	$ 428
Financing receivable, net of allowance for credit losses, current	241		247
Financing receivable, after allowance for credit loss, noncurrent	466		554
Automotive sales \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-07-01
Summary of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 962
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	$ 287
Automotive regulatory credits \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-07-01
Summary of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 220
Deferred revenue, expected to recognize period	12 months
Energy generation and storage segment
Summary of Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,310		2,040
Revenue recognized	1,120	$ 944
Financing receivable, net of allowance for credit losses, current	41		38
Financing receivable, after allowance for credit loss, noncurrent	695		$ 731
Energy generation and storage segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-07-01
Summary of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 4,560
Deferred revenue, expected to recognize period	12 months