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Intangibles - Summary of Changes in Carrying Amounts of Intangible Assets Including DAC, VOBA , and DSI (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Total    
Balance at beginning of period $ 1,724 $ 0
Purchase price allocation adjustments 61  
Deferrals and F&G acquisition 675 297
Amortization (517) (131)
Interest 44 22
Unlocking 12 2
Adjustment for net unrealized investment gains 35 (313)
Balance at end of period 2,034 1,724
F&G    
Total    
Deferrals and F&G acquisition   1,847
VOBA    
Total    
Balance at beginning of period 1,466 0
Purchase price allocation adjustments 61  
Deferrals and F&G acquisition 0 0
Amortization (436) (120)
Interest 30 20
Unlocking 13 2
Adjustment for net unrealized investment gains 51 (283)
Balance at end of period 1,185 1,466
VOBA | F&G    
Total    
Deferrals and F&G acquisition   1,847
DAC    
Total    
Balance at beginning of period 222 0
Purchase price allocation adjustments 0  
Deferrals and F&G acquisition 585 251
Amortization (46) (6)
Interest 13 2
Unlocking 1 0
Adjustment for net unrealized investment gains (14) (25)
Balance at end of period 761 222
DAC | F&G    
Total    
Deferrals and F&G acquisition   0
DSI    
Total    
Balance at beginning of period 36 0
Purchase price allocation adjustments 0  
Deferrals and F&G acquisition 90 46
Amortization (35) (5)
Interest 1 0
Unlocking (2) 0
Adjustment for net unrealized investment gains (2) (5)
Balance at end of period $ 88 36
DSI | F&G    
Total    
Deferrals and F&G acquisition   $ 0