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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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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Overview & Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 6,610
Guarantees carrying value	1,040		$ 166
Accounts receivable, net	3,313		3,508
Other non-current assets	4,989		4,531
MyPower customer notes receivable, net of allowance for credit losses	250		266
Financing receivable, net of allowance for credit losses, current	5		5
Allowance for credit losses	36		36
Government Rebates Receivables
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, net	315		378
Other non-current assets	0		207
Automotive sales
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue	3,610		3,540
Revenue recognized	711	$ 360
Financing receivable, Net	245		242
Automotive sales \| Other non-current assets
Summary Of Significant Accounting Policies [Line Items]
Financing receivable, Net	868		1,040
Automotive sales \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 821
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	$ 4,720
Automotive regulatory credits \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 683
Deferred revenue, expected to recognize period	12 months
Energy generation and storage segment
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue	$ 1,730		1,600
Revenue recognized	1,090	$ 511
Financing receivable, Net	32		31
Energy generation and storage segment \| Other non-current assets
Summary Of Significant Accounting Policies [Line Items]
Financing receivable, Net	641		$ 578
Energy generation and storage segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Summary Of Significant Accounting Policies [Line Items]
Unbilled transaction price allocated to performance obligations, expected of more than one year	$ 4,230
Deferred revenue, expected to recognize period	12 months