Contingencies and Commitments (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) agreement	Dec. 31, 2023 USD ($)
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4,041
Number of Agreements	132
Obligations Number Of Agreements	132
Accrual for Environmental Loss Contingencies	$ 8	$ 9
Letters of Credit Outstanding, Amount	643
Customary payment guarantees	1,600
Tax equity financing guarantees	995
Subsidiaries
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,600
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 3,566
Number of Agreements	84
Obligations Number Of Agreements	84
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 210
Number of Agreements	30
Obligations Number Of Agreements	30
Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 29
Number of Agreements	12
Obligations Number Of Agreements	12
Surety Bond
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2
Number of Agreements	2
Obligations Number Of Agreements	2
Standby Letters of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 234
Number of Agreements \| agreement	4
Obligations Number Of Agreements \| agreement	4
Minimum [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligation, Term	1 year
Minimum [Member] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1
Minimum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	1
Minimum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1
Minimum [Member] \| Standby Letters of Credit [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.00%
Letter of credit fee percentage paid	1.00%
Maximum [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligation, Term	33 years
Maximum [Member] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 970
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	70
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	6
Maximum [Member] \| Surety Bond
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1
Maximum [Member] \| Standby Letters of Credit [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	3.00%
Letter of credit fee percentage paid	3.00%

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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