Contingencies and Commitments (Details) $ in Millions	9 Months Ended
Sep. 30, 2023 USD ($) agreement
Schedule Of Contingent Contractual Obligations [Line Items]
The range of expiration dates of guarantees made by the Parent Company	less than one year to no more than 33 years
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,856
Number of Agreements	122
Obligations Number Of Agreements	122
Accrual for Environmental Loss Contingencies	$ 10
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,431
Number of Agreements	81
Obligations Number Of Agreements	81
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 136
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	$ 39
Number of Agreements	6
Obligations Number Of Agreements	6
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	$ 248
Number of Agreements \| agreement	3
Obligations Number Of Agreements \| agreement	3
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	$ 484
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	50
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	30
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%

Number of agreements under which the Parent Company has contingent contractual obligations.

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

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Describe the approximate term of the guarantee or each group of similar guarantees.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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