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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense - pre-tax, recognized $ 211.0 $ 199.0 $ 288.0
RSU expense 29.0    
Unrecognized compensation cost related to grants 42.0    
Proceeds from stock options exercised $ 162.0    
Weighted Average Remaining Contractual Life, options exercisable, end of year (years) 5 years 10 months 13 days    
Stock Options      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock options, weighted average grant-date fair value $ 12.51 $ 11.43 $ 10.77
Share-based compensation expense - pre-tax, recognized $ 18.0    
Share-based compensation expense - pre-tax, not yet recognized $ 13.0    
Share-based compensation expense, expected period for amortization 2 years 3 months    
Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense, expected period for amortization 4 years 3 months    
Vesting period (in years) 1 year 1 month 2 days    
Granted (in shares) 241,536 208,641 1,070,458
Deferred Stock Units (DSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense - pre-tax, recognized $ 2.6 $ 2.6 $ 2.7
Granted (in shares) 33,940 47,344 46,273
Minimum | Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Vesting period (in years) 1 year    
Minimum | Awarded 2020 To 2022      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Percentage of performance period depending on which actual number of awards can be earned 0.00%    
Maximum | Stock Options      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Contractual term of the option 10 years    
Involuntary termination expiration period (in years) 3 years    
Maximum | Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Vesting period (in years) 5 years    
Maximum | Awarded 2020 To 2022      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Percentage of performance period depending on which actual number of awards can be earned 200.00%    
AIG 2021 Omnibus Incentive Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Common stock reserved for future grant (in shares) 8,100,000    
Reduction in number of shares available for grants (in shares) 1    
Number of shares reserved for future grants (in shares) 23,168,953    
Long Term Incentive Plans      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Performance period 3 years