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Contingencies (Loss Contingencies) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) agreement | Dec. 31, 2021 USD ($) agreement | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Term |  | less than one year to no more than 15 years |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2,331 | $ 2,331 |  |
Number of Agreements | agreement | 149 | 149 |  |
Environmental Remediation Contingency [Domain] |  |  |  |
Environmental Contingencies |  |  |  |
Liability recorded for projected environmental remediation costs | $ 4 | $ 4 |  | $ 5
Guarantee Obligations [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2,162 | $ 2,162 |  |
Number of Agreements | agreement | 90 | 90 |  |
Litigation |  |  |  |
Litigation Contingencies |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | $ 23 | $ 23 |  | 28
Parent Company [Member] | Guarantees [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2,200 | $ 2,200 |  |
Number of Agreements | agreement | 90 | 90 |  |
AES Tiete [Domain] | Compensation from Concession Agreement |  |  |  |
Litigation Contingencies |  |  |  |
Reversal of Cost of Goods Sold |  |  |  | 6
Deferred Compensation Arrangement with Individual, Requisite Service Period | 2 years 8 months 12 days |  |  |
Other Intangible Assets, Net |  |  | $ 190 |
AES Tiete |  |  |  |
Litigation Contingencies |  |  |  |
Reversal of Cost of Goods Sold |  |  |  | 184
AES Tiete | Compensation from Concession Agreement |  |  |  |
Litigation Contingencies |  |  |  |
Other Intangible Assets, Net |  |  |  | $ 184
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 119 | $ 119 |  |
Number of Agreements | agreement | 31 | 31 |  |
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 48 | $ 48 |  |
Number of Agreements | agreement | 26 | 26 |  |
Secured Debt [Member] | Surety Bond |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2 | $ 2 |  |
Number of Agreements | agreement | 2 | 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 | $ 0 | $ 0 |  |
Minimum [Member] | Litigation |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 255 | 255 |  |
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 0 | 0 |  |
Minimum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 0 | 0 |  |
Minimum [Member] | Secured Debt [Member] | Surety Bond |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 1 | $ 1 |  |
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 | 11 | $ 11 |  |
Maximum [Member] | Guarantee Obligations [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 400 | 400 |  |
Maximum [Member] | Litigation |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 898 | 898 |  |
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 42 | 42 |  |
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | 16 | 16 |  |
Maximum [Member] | Secured Debt [Member] | Surety Bond |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | $ 1 | $ 1 |  |

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