Intangibles - Summary of Changes in Carrying Amounts of Intangible Assets Including DAC, VOBA , and DSI (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Total
Balance at beginning of period		$ 0
F&G acquisition		1,890
Deferrals	$ 34
Amortization	(3)
Interest	3
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(111)
Balance at end of period	1,813	1,813
VOBA
Total
Balance at beginning of period		0
F&G acquisition		1,890
Deferrals	0
Amortization	(3)
Interest	3
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(101)
Balance at end of period	1,789	1,789
DAC
Total
Balance at beginning of period		0
F&G acquisition		0
Deferrals	28
Amortization	0
Interest	0
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(8)
Balance at end of period	20	20
DSI
Total
Balance at beginning of period		0
F&G acquisition		0
Deferrals	6		$ 0
Amortization	0
Interest	0
Unlocking	0
Adjustment for net unrealized investment (gains) losses	(2)
Balance at end of period	$ 4	$ 4