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Intangibles - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 135 $ 138 $ 131
Estimated amortization, 2022 116    
Estimated amortization, 2023 93    
Estimated amortization, 2024 61    
Estimated amortization, 2025 44    
Estimated amortization, 2026 34    
VOBA      
Finite-Lived Intangible Assets [Line Items]      
Adjustment for net unrealized investment gains $ (232) (283)  
VOBA | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Interest accrual rate utilized to calculate accretion of interest 0.00%    
VOBA | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Interest accrual rate utilized to calculate accretion of interest 4.71%    
DAC      
Finite-Lived Intangible Assets [Line Items]      
Cumulative adjustments for net unrealized investment gains $ 39 25  
Deferred sales inducement, unrealized investment gain $ 7 $ 5