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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense - pre-tax, recognized $ 288.0 $ 278.0 $ 274.0
RSU expense 21.0    
Unrecognized compensation cost related to grants 65.0    
Proceeds from stock options exercised $ 68.0    
Weighted Average Remaining Contractual Life, options exercisable, end of year (years) 5 years 11 months 19 days    
Stock Options      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock options, weighted average grant-date fair value $ 10.77 $ 10.00 $ 9.61
Share-based compensation expense - pre-tax, recognized $ 28.0    
Share-based compensation expense - pre-tax, not yet recognized $ 17.0    
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]      
Granted (in shares) 1,070,458 493,140 583,068
Converted (in shares) (91,300) 0 0
Restricted Stock Units (RSUs) | CoreBridge      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Converted (in shares) 10,000,000    
Deferred Stock Units (DSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense - pre-tax, recognized $ 2.7 $ 2.7 $ 2.4
Granted (in shares) 46,273 55,133 94,062
OtherRSU      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation expense, expected period for amortization 5 years    
Vesting period (in years) 2 years 2 months 23 days    
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) 24,654,162    
Long Term Incentive Plans      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Performance period 3 years    
Long Term Incentive Plans | Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Converted (in shares) 4,000,000