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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