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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of loss contingency liability.

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

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Contingencies (Loss Contingencies) (Details) $ in Millions	12 Months Ended
Contingencies (Loss Contingencies) (Details) $ in Millions	Dec. 31, 2023 USD ($) agreement	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Guarantor Obligations, Term	less than one year to no more than 33 years
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4,527
Obligations number of agreements \| agreement	144
Subsidiary Guarantee, Maximum Undiscounted Exposure	$ 2,800
Subsidiary Guarantee, Customary Payment Agreements	1,800
Subsidiary Guarantee, Tax Equity Financing Guarantees	1,000
Letters of credit outstanding	359
Environmental Remediation Contingency [Domain]
Environmental Contingencies
Liability recorded for projected environmental remediation costs	9	$ 10
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 3,978
Obligations number of agreements \| agreement	90
Litigation
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	$ 17	$ 22
Parent Company [Member] \| Guarantees [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4,000
Obligations number of agreements \| agreement	90
Unsecured Debt [Member] \| Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 188
Obligations number of agreements \| agreement	31
Secured Debt [Member] \| Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 124
Obligations number of agreements \| agreement	17
Secured Debt [Member] \| Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 235
Obligations number of agreements \| agreement	4
Secured Debt [Member] \| Surety Bond
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2
Obligations number of agreements \| agreement	2
Minimum [Member] \| Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.00%
Minimum [Member] \| Guarantee Obligations [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	$ 1
Minimum [Member] \| Litigation
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	146
Minimum [Member] \| Unsecured Debt [Member] \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	1
Minimum [Member] \| Secured Debt [Member] \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	1
Minimum [Member] \| Secured Debt [Member] \| Surety Bond
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	1
Minimum [Member] \| Line of Credit \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	$ 54
Maximum [Member] \| Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	3.00%
Maximum [Member] \| Environmental Remediation Contingency [Domain]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	$ 13
Maximum [Member] \| Guarantee Obligations [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	970
Maximum [Member] \| Litigation
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	185
Maximum [Member] \| Unsecured Debt [Member] \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	70
Maximum [Member] \| Secured Debt [Member] \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	40
Maximum [Member] \| Secured Debt [Member] \| Surety Bond
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	1
Maximum [Member] \| Line of Credit \| Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	$ 64