Intangibles - Summary of Changes in Carrying Amounts of Intangible Assets Including DAC, VOBA , and DSI (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Total
Balance at beginning of period	$ 0
F&G acquisition	1,903
Deferrals	155
Amortization	(61)
Interest	13
Unlocking	(1)
Adjustment for net unrealized investment (gains) losses	(247)
Balance at end of period	1,762
VOBA
Total
Balance at beginning of period	0
F&G acquisition	1,903
Deferrals	0
Amortization	(56)
Interest	12
Unlocking	(1)
Adjustment for net unrealized investment (gains) losses	(228)
Balance at end of period	1,630
DAC
Total
Balance at beginning of period	0
F&G acquisition	0
Deferrals	130
Amortization	(3)
Interest	1
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(15)
Balance at end of period	113
DSI
Total
Balance at beginning of period	0
F&G acquisition	0
Deferrals	25
Amortization	(2)
Interest	0
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(4)
Balance at end of period	$ 19