Contingencies and Commitments (Details) $ in Millions	3 Months Ended
Mar. 31, 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 18 years
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,902
Number of Agreements	127
Obligations Number Of Agreements	127
Accrual for Environmental Loss Contingencies	$ 10
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,648
Number of Agreements	73
Obligations Number Of Agreements	73
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 109
Number of Agreements	34
Obligations Number Of Agreements	34
Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 20
Number of Agreements	16
Obligations Number Of Agreements	16
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	$ 123
Number of Agreements \| agreement	2
Obligations Number Of Agreements \| agreement	2
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	$ 400
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	36
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
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

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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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
-Topic 460
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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
-Topic 460
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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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