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Contingencies and Commitments (Details) $ in Millions	Sep. 30, 2025 USD ($) agreement	Dec. 31, 2024 USD ($)
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 5,663
Number of Agreements	126
Obligations Number Of Agreements	126
Accrual for Environmental Loss Contingencies	$ 1	$ 2
Letters of Credit Outstanding, Amount	1,800
Customary payment guarantees	2,000
Tax equity financing guarantees	949
Surety Bonds and Other Guarantees	1,300
Subsidiaries
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	6,100
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 5,149
Number of Agreements	87
Obligations Number Of Agreements	87
Financial Standby Letter of Credit [Member] | Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 158
Number of Agreements	9
Obligations Number Of Agreements	9
Financial Standby Letter of Credit [Member] | Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 38
Number of Agreements	23
Obligations Number Of Agreements	23
Surety Bond
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1
Number of Agreements	1
Obligations Number Of Agreements	1
Standby Letters of Credit [Member] | Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 317
Number of Agreements | agreement	6
Obligations Number Of Agreements | agreement	6
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
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	10
Maximum [Member] | Surety Bond
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1

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