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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Net deferred income tax asset | $ 1,709 | $ 1,222 | $ 1,709 |  |
Operating loss carryforwards |  | 4,000 |  |  |
Deferred tax liabilities, other comprehensive income | 7 | 0 | 7 |  |
Uncertain tax positions | 36 | 0 | 36 | $ 38 | $ 39
State and Local Jurisdiction |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  | $ 20 | $ 9 |  |
State and Local Jurisdiction | State of Illinois |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  |  | $ 74 |
Internal Revenue Service (IRS) |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | $ 3 |  |  |  |
Domestic Tax Authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Inflation Reduction Act of 2022, alternative minimum tax on book income of certain large corporations |  | 15.00% |  |  |
Inflation Reduction Act of 2022, excise tax on net stock repurchases |  | 1.00% |  |  |
Inflation Reduction Act of 2022, alternative minimum tax on book income of certain large corporations, three-year average annual adjusted financial statement income |  | $ 1,000 |  |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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