Summary of Significant Unobservable Inputs Used for Fair Value Measurements Classified As Level 3 (Detail) $ in Millions		6 Months Ended
		Jun. 30, 2022 USD ($) bps		Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $		$ 868		$ 616
Fixed maturity securities available-for-sale, at fair value | $		49,286		60,480
Derivative assets, fair value | $		96		433
Policyholder account balances
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $		526		590
Policyholder account balances | GMWB embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $	[1]	277		271
Policyholder account balances | Fixed index annuity embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $		233		294
Policyholder account balances | Indexed universal life embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $		16		25
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fixed maturity securities available-for-sale, at fair value | $		$ 3,362		3,808
Level 3 | Other invested assets | Equity index options
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Discounted cash flows
Derivative assets, fair value | $		$ 30
Fair value input, equity index volatility, lower limit		6.00%
Fair value input, equity index volatility, upper limit		35.00%
Fair value input, equity index volatility, weighted-average	[2]	19.00%
Level 3 | Policyholder account balances
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liabilities, fair value | $		$ 526		590
Level 3 | Policyholder account balances | GMWB embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique	[3]	Stochastic cash flow model
Derivative liabilities, fair value | $	[1]	$ 277	[3]	271
Fair value, withdrawal utilization rate, lower limit		61.00%
Fair value, withdrawal utilization rate, upper limit		88.00%
Fair value, lapse rate, lower limit		2.00%
Fair value, lapse rate, upper limit		9.00%
Fair value input, credit spreads, lower limit		36
Fair value input, credit spreads, upper limit		83
Fair value input, credit spreads, weighted-average	[4]	69
Fair value input, equity index volatility, lower limit	[3]	20.00%
Fair value input, equity index volatility, upper limit	[3]	29.00%
Fair value, withdrawal utilization rate, weighted-average	[4]	77.00%
Fair value, lapse rate, weighted-average	[4]	3.00%
Fair value input, equity index volatility, weighted-average	[3],[4]	24.00%
Level 3 | Policyholder account balances | Fixed index annuity embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Option budget method
Derivative liabilities, fair value | $		$ 233		294
Fair value, expected future interest credited, lower limit		0.00%
Fair value, expected future interest credited, upper limit		3.00%
Fair value, expected future interest credited, weighted-average	[4]	1.00%
Level 3 | Policyholder account balances | Indexed universal life embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Option budget method
Derivative liabilities, fair value | $		$ 16		$ 25
Fair value, expected future interest credited, lower limit		3.00%
Fair value, expected future interest credited, upper limit		14.00%
Fair value, expected future interest credited, weighted-average	[4]	5.00%
Internal Models | Level 3 | U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 1,973
Fair value input, credit spreads, lower limit		41
Fair value input, credit spreads, upper limit		322
Fair value input, credit spreads, weighted-average	[2]	188
Internal Models | Level 3 | U.S. corporate | Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 781
Fair value input, credit spreads, lower limit		57
Fair value input, credit spreads, upper limit		316
Fair value input, credit spreads, weighted-average	[2]	175
Internal Models | Level 3 | U.S. corporate | Energy
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 46
Fair value input, credit spreads, lower limit		166
Fair value input, credit spreads, upper limit		306
Fair value input, credit spreads, weighted-average	[2]	229
Internal Models | Level 3 | U.S. corporate | Finance and insurance
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 649
Fair value input, credit spreads, lower limit		75
Fair value input, credit spreads, upper limit		322
Fair value input, credit spreads, weighted-average	[2]	218
Internal Models | Level 3 | U.S. corporate | Consumer—non-cyclical
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 86
Fair value input, credit spreads, lower limit		72
Fair value input, credit spreads, upper limit		306
Fair value input, credit spreads, weighted-average	[2]	171
Internal Models | Level 3 | U.S. corporate | Technology and communications
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 25
Fair value input, credit spreads, lower limit		128
Fair value input, credit spreads, upper limit		184
Fair value input, credit spreads, weighted-average	[2]	163
Internal Models | Level 3 | U.S. corporate | Industrial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 33
Fair value input, credit spreads, lower limit		159
Fair value input, credit spreads, upper limit		308
Fair value input, credit spreads, weighted-average	[2]	227
Internal Models | Level 3 | U.S. corporate | Capital goods
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 38
Fair value input, credit spreads, lower limit		97
Fair value input, credit spreads, upper limit		263
Fair value input, credit spreads, weighted-average	[2]	185
Internal Models | Level 3 | U.S. corporate | Consumer—cyclical
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 119
Fair value input, credit spreads, lower limit		107
Fair value input, credit spreads, upper limit		244
Fair value input, credit spreads, weighted-average	[2]	180
Internal Models | Level 3 | U.S. corporate | Transportation
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 47
Fair value input, credit spreads, lower limit		41
Fair value input, credit spreads, upper limit		210
Fair value input, credit spreads, weighted-average	[2]	143
Internal Models | Level 3 | U.S. corporate | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 149
Fair value input, credit spreads, lower limit		116
Fair value input, credit spreads, upper limit		219
Fair value input, credit spreads, weighted-average	[2]	140
Internal Models | Level 3 | Non-U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 934
Fair value input, credit spreads, lower limit		72
Fair value input, credit spreads, upper limit		306
Fair value input, credit spreads, weighted-average	[2]	175
Internal Models | Level 3 | Non-U.S. corporate | Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 309
Fair value input, credit spreads, lower limit		87
Fair value input, credit spreads, upper limit		290
Fair value input, credit spreads, weighted-average	[2]	167
Internal Models | Level 3 | Non-U.S. corporate | Energy
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 124
Fair value input, credit spreads, lower limit		123
Fair value input, credit spreads, upper limit		263
Fair value input, credit spreads, weighted-average	[2]	191
Internal Models | Level 3 | Non-U.S. corporate | Finance and insurance
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 131
Fair value input, credit spreads, lower limit		122
Fair value input, credit spreads, upper limit		216
Fair value input, credit spreads, weighted-average	[2]	172
Internal Models | Level 3 | Non-U.S. corporate | Consumer—non-cyclical
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 66
Fair value input, credit spreads, lower limit		72
Fair value input, credit spreads, upper limit		248
Fair value input, credit spreads, weighted-average	[2]	161
Internal Models | Level 3 | Non-U.S. corporate | Technology and communications
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 26
Fair value input, credit spreads, lower limit		123
Fair value input, credit spreads, upper limit		207
Fair value input, credit spreads, weighted-average	[2]	164
Internal Models | Level 3 | Non-U.S. corporate | Industrial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 69
Fair value input, credit spreads, lower limit		97
Fair value input, credit spreads, upper limit		225
Fair value input, credit spreads, weighted-average	[2]	153
Internal Models | Level 3 | Non-U.S. corporate | Capital goods
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 115
Fair value input, credit spreads, lower limit		72
Fair value input, credit spreads, upper limit		306
Fair value input, credit spreads, weighted-average	[2]	200
Internal Models | Level 3 | Non-U.S. corporate | Consumer—cyclical
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 52
Fair value input, credit spreads, lower limit		159
Fair value input, credit spreads, upper limit		260
Fair value input, credit spreads, weighted-average	[2]	198
Internal Models | Level 3 | Non-U.S. corporate | Transportation
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 20
Fair value input, credit spreads, lower limit		185
Fair value input, credit spreads, upper limit		219
Fair value input, credit spreads, weighted-average	[2]	189
Internal Models | Level 3 | Non-U.S. corporate | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation technique		Internal models
Fixed maturity securities available-for-sale, at fair value | $		$ 22
Fair value input, credit spreads, lower limit		86
Fair value input, credit spreads, upper limit		161
Fair value input, credit spreads, weighted-average	[2]	135

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

[2] Unobservable inputs weighted by the relative fair value of the associated instrument for fixed maturity securities and by notional for derivative assets.

[3] Represents embedded derivatives associated with our GMWB liabilities, excluding the impact of reinsurance. The unobservable inputs associated with GMWB embedded derivatives are not interrelated and therefore, a directional change in one input will not affect the other inputs.

[4] Unobservable inputs weighted by the policyholder account balances associated with the instrument.