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Value of Business Acquired, Deferred Acquisition Costs and Deferred Sales Inducements - Summary of Changes in Carrying Amounts of Intangible Assets Including DAC, VOBA and DSI (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Total
Balance at beginning of period	$ 1,724	$ 0
F&G acquisition		1,903
Deferrals	492	155
Amortization	(436)	(61)
Interest	32	13
Unlocking	(1)	(1)
Adjustment for net unrealized investment losses (gains)	19	(247)
Purchase price allocation adjustments	61
Balance at end of period	1,891	1,762
VOBA
Total
Balance at beginning of period	1,466	0
F&G acquisition		1,903
Deferrals	0	0
Amortization	(376)	(56)
Interest	23	12
Unlocking	(1)	(1)
Adjustment for net unrealized investment losses (gains)	38	(228)
Purchase price allocation adjustments	61
Balance at end of period	1,211	1,630
DAC
Total
Balance at beginning of period	222	0
F&G acquisition		0
Deferrals	427	130
Amortization	(34)	(3)
Interest	8	1
Unlocking	1	0
Adjustment for net unrealized investment losses (gains)	(18)	(15)
Purchase price allocation adjustments	0
Balance at end of period	606	113
DSI
Total
Balance at beginning of period	36	0
F&G acquisition		0
Deferrals	65	25
Amortization	(26)	(2)
Interest	1	0
Unlocking	(1)	0
Adjustment for net unrealized investment losses (gains)	(1)	(4)
Purchase price allocation adjustments	0
Balance at end of period	$ 74	$ 19

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