Intangibles - Narrative (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 01, 2020
Finite-Lived Intangible Assets [Line Items]
Unearned revenue liability	$ 0	$ 0
Deferrals		(4,000,000)
Amortization expense		0
Interest		0
Unlocking		0
Unrealized investment gain (losses)		$ 4,000,000
VOBA
Finite-Lived Intangible Assets [Line Items]
Adjustment for net unrealized investment gains	$ 101,000,000
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	4.66%
DAC
Finite-Lived Intangible Assets [Line Items]
Cumulative adjustments for net unrealized investment gains			$ 8,000,000
Deferred sales inducement, unrealized investment gain	$ 2,000,000