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Financing Agreements - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Feb. 24, 2021
Dec. 31, 2020
Nov. 01, 2019
Debt Instrument [Line Items]        
Outstanding par amount of guaranteed debentures $ 2,971.0   $ 3,045.0  
Aetna Notes        
Debt Instrument [Line Items]        
Amount of letters of credit outstanding 163.0      
Revolving Credit agreement        
Debt Instrument [Line Items]        
Minimum net worth required for compliance       $ 6,150.0
Maximum borrowing capacity 500.0      
Voya Holdings Debentures | Aetna Notes        
Debt Instrument [Line Items]        
Amount of collateral deposited to a control account 199.0      
Amount of collateral for credit facility 362.0      
Debentures | Voya Holdings Debentures        
Debt Instrument [Line Items]        
Outstanding par amount of guaranteed debentures 358.0      
Revolving Credit agreement        
Debt Instrument [Line Items]        
Outstanding borrowings 0.0      
Amount of letters of credit outstanding 0.0      
Senior Notes | 3.125% Senior Notes, due 2024 (2)(3)        
Debt Instrument [Line Items]        
Outstanding par amount of guaranteed debentures $ 375.0 $ 23.0 $ 398.0  
Debt Instrument, Repurchase Amount   $ 25.0    
Annual interest rate on debt 3.125%