Contingencies and Commitments (Details) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($) agreement	Dec. 31, 2024 USD ($)
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 5,248
Number of Agreements	143
Obligations Number Of Agreements	143
Accrual for Environmental Loss Contingencies	$ 1	$ 2
Letters of Credit Outstanding, Amount	1,600
Customary payment guarantees	1,900
Tax equity financing guarantees	816
Surety Bonds and Other Guarantees	1,300
Subsidiaries
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	5,600
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4,725
Number of Agreements	101
Obligations Number Of Agreements	101
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 163
Number of Agreements	11
Obligations Number Of Agreements	11
Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 48
Number of Agreements	22
Obligations Number Of Agreements	22
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	$ 310
Number of Agreements \| agreement	7
Obligations Number Of Agreements \| agreement	7
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] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1,110
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	60
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	20
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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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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