Contingencies and Commitments (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($) agreement	Dec. 31, 2021 USD ($)
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 14 years
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,433
Number of Agreements \| agreement	152
Obligations Number Of Agreements \| agreement	152
Accrual for Environmental Loss Contingencies	$ 4	$ 4
Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2,277
Number of Agreements	98
Obligations Number Of Agreements	98
Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 140
Number of Agreements	35
Obligations Number Of Agreements	35
Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 14
Number of Agreements	17
Obligations Number Of Agreements	17
Surety Bond
Schedule Of Contingent Contractual Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2
Number of Agreements	2
Obligations Number Of Agreements	2
Minimum [Member] \| Guarantee Obligations [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 0
Minimum [Member] \| Financial Standby Letter of Credit [Member] \| Unsecured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Minimum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 0
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	37
Maximum [Member] \| Financial Standby Letter of Credit [Member] \| Secured Debt [Member]
Schedule Of Contingent Contractual Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	3
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.

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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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Describe the approximate term of the guarantee or each group of similar guarantees.

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

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