Liabilities Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 525	$ 657	$ 590	$ 804
Total realized and unrealized (gains) losses included in net (income)		9	8	(48)	(111)
Total realized and unrealized (gains) losses included in OCI		0	0	0	0
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		9	10	22	23
Settlements		(17)	(37)	(37)	(78)
Transfer into Level 3		0	0	0	0
Transfer out of Level 3		0	0	(1)	0
Ending balance		526	638	526	638
Total (gains) losses included in net (income) attributable to liabilities still held		12	7	(41)	(106)
Total (gains) losses included in OCI attributable to liabilities still held		0	0	0	0
Policyholder account balances
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		525	657	590	804
Total realized and unrealized (gains) losses included in net (income)		9	8	(48)	(111)
Total realized and unrealized (gains) losses included in OCI		0	0	0	0
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		9	10	22	23
Settlements		(17)	(37)	(37)	(78)
Transfer into Level 3		0	0	0	0
Transfer out of Level 3		0	0	(1)	0
Ending balance		526	638	526	638
Total (gains) losses included in net (income) attributable to liabilities still held		12	7	(41)	(106)
Total (gains) losses included in OCI attributable to liabilities still held		0	0	0	0
Policyholder account balances | GMWB embedded derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	[1]	243	272	271	379
Total realized and unrealized (gains) losses included in net (income)	[1]	28	(3)	(6)	(116)
Total realized and unrealized (gains) losses included in OCI	[1]	0	0	0	0
Purchases	[1]	0	0	0	0
Sales	[1]	0	0	0	0
Issuances	[1]	6	6	12	12
Settlements	[1]	0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance	[1]	277	275	277	275
Total (gains) losses included in net (income) attributable to liabilities still held	[1]	31	(4)	1	(111)
Total (gains) losses included in OCI attributable to liabilities still held	[1]	0	0	0	0
Policyholder account balances | Fixed index annuity embedded derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		261	362	294	399
Total realized and unrealized (gains) losses included in net (income)		(11)	14	(23)	18
Total realized and unrealized (gains) losses included in OCI		0	0	0	0
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(17)	(37)	(37)	(78)
Transfer into Level 3		0	0	0	0
Transfer out of Level 3		0	0	(1)	0
Ending balance		233	339	233	339
Total (gains) losses included in net (income) attributable to liabilities still held		(11)	14	(23)	18
Total (gains) losses included in OCI attributable to liabilities still held		0	0	0	0
Policyholder account balances | Indexed universal life embedded derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		21	23	25	26
Total realized and unrealized (gains) losses included in net (income)		(8)	(3)	(19)	(13)
Total realized and unrealized (gains) losses included in OCI		0	0	0	0
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		3	4	10	11
Settlements		0	0	0	0
Transfer into Level 3		0	0	0	0
Transfer out of Level 3		0	0	0	0
Ending balance		16	24	16	24
Total (gains) losses included in net (income) attributable to liabilities still held		(8)	(3)	(19)	(13)
Total (gains) losses included in OCI attributable to liabilities still held		$ 0	$ 0	$ 0	$ 0

[1] Represents embedded derivatives associated with our GMWB liabilities, excluding the impact of reinsurance.