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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities | The Company has recorded regulatory assets and liabilities (in millions) that it expects to pass through to its customers in accordance with, and subject to, regulatory provisions as follows:
December 31, | 2021 |  | 2020 |  | Recovery/Refund Period
Regulatory assets |  |  |
Current regulatory assets: |  |  |  |  |
El Salvador energy pass through costs recovery | $ | 80 |  |  | $ | 40 |  |  | Quarterly
Other | 88 |  |  | 73 |  |  | 1 year
Total current regulatory assets | 168 |  |  | 113 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
AES Indiana and AES Ohio defined benefit pension obligations (1) | 191 |  |  | 244 |  |  | Various
AES Indiana deferred fuel and purchased power costs | 84 |  |  | — |  |  | To be determined
AES Indiana environmental costs | 76 |  |  | 81 |  |  | Various
AES Indiana Petersburg Units 1 and 2 retirement costs | 300 |  |  | 75 |  |  | Over life of assets
AES Indiana deferred Midwest ISO costs | 48 |  |  | 61 |  |  | 5 years
Other | 135 |  |  | 126 |  |  | Various
Total noncurrent regulatory assets | 834 |  |  | 587 |  |  |
Total regulatory assets | $ | 1,002 |  |  | $ | 700 |  |  |
Regulatory liabilities |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
Overcollection of costs to be passed back to customers | $ | 18 |  |  | $ | 47 |  |  | 1 year
Other | 1 |  |  | 1 |  |  | Various
Total current regulatory liabilities | 19 |  |  | 48 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
AES Indiana and AES Ohio accrued costs of removal and AROs | 868 |  |  | 863 |  |  | Over life of assets
AES Indiana and AES Ohio income taxes payable to customers through rates | 158 |  |  | 174 |  |  | Various
Other | 30 |  |  | 21 |  |  | Various
Total noncurrent regulatory liabilities | 1,056 |  |  | 1,058 |  |  |
Total regulatory liabilities | $ | 1,075 |  |  | $ | 1,106 |  |  |
_____________________________ (1)Past expenditures on which the Company earns a rate of return.

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