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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |
Refund of AMT credit carryforwards |  |  | $ 572
Deferred tax liabilities | $ 117 |  |
State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Reduction in deferred tax liability | 490 |  |
Reduction of deferred tax assets | $ 25 |  |
AMT credit carryforwards |  |  |
Income Tax Disclosure [Line Items] |  |  |
Refund of AMT credit carryforwards |  | $ 572 |
Income tax interest income |  | $ 19 |

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