Contingencies and Commitments (Details) $ in Millions	Mar. 31, 2026 USD ($) agreement
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4,227
Number of Agreements \| agreement	58
Obligations Number Of Agreements \| agreement	58
Accrual for Environmental Loss Contingencies	$ 1
Obligations Number of Agreements, Subsidiaries \| agreement	539
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 4,532
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 3,773
Number of Agreements \| agreement	24
Obligations Number Of Agreements \| agreement	24
Obligations Number of Agreements, Subsidiaries \| agreement	40
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 2,503
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 117
Number of Agreements \| agreement	7
Obligations Number Of Agreements \| agreement	7
Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 9
Number of Agreements \| agreement	15
Obligations Number Of Agreements \| agreement	15
Obligations Number of Agreements, Subsidiaries \| agreement	391
Surety Bond \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Obligations Number of Agreements, Subsidiaries \| agreement	108
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 74
Standby Letters of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 328
Number of Agreements \| agreement	12
Obligations Number Of Agreements \| agreement	12
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 1,955
Minimum [Member] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	1
Subsidiary Guarantee, Maximum Undiscounted Exposure	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
Subsidiary Guarantee, Maximum Undiscounted Exposure	1
Minimum [Member] \| Surety Bond \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Subsidiary Guarantee, Maximum Undiscounted Exposure	1
Maximum [Member] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	1,117
Subsidiary Guarantee, Maximum Undiscounted Exposure	439
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	4
Subsidiary Guarantee, Maximum Undiscounted Exposure	85
Maximum [Member] \| Surety Bond \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 10

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

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

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