Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 44,688	[1]	$ 46,976		$ 50,189
Other comprehensive loss, net of tax	(206)		(592)	[1]	(57)	[1]
Less: Net translation (loss) on foreign currencies attributable to noncontrolling interests	0		(2)	[1]	(14)	[1]
Shareholders other comprehensive income (loss), net of tax	(206)		(590)		(43)
Balance	46,244		44,688	[1]	46,976
Previously Reported
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					50,328
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					(139)
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,658)		(1,068)		(1,025)
Shareholders other comprehensive income (loss), net of tax	(206)		(590)		(43)
Balance	(1,864)		(1,658)		(1,068)
Accumulated Other Comprehensive (Loss) | Previously Reported
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					(861)
Accumulated Other Comprehensive (Loss) | Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					(164)
Securities and Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(332)		1,266		1,568
Other comprehensive income (loss) before reclassifications, before tax	620		(2,274)		(335)
Other comprehensive income (loss), before reclassifications, tax	(146)		467		52
Other comprehensive income (loss) before reclassifications, after-tax	474		(1,807)		(283)
Reclassification adjustment, tax	(8)		(10)		5
Net amounts reclassified from AOCI to net income	29		209		(19)
Shareholders other comprehensive income (loss), net of tax	503		(1,598)		(302)
Balance	171		(332)		1,266
Securities and Derivatives | Previously Reported
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					900
Securities and Derivatives | Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					668
AOCI, Accumulated Gain (Loss), Debt Securities, Available-For-Sale And Derivatives, (Gain) Loss On Sale Of Business, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	0		172		0
Reclassification adjustment for losses (gains) included in Shareholders' net income (Net realized investment (losses) gains)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	38		47		(24)
Reclassification adjustment for (gains) included in Shareholders' net income (Selling, general and administrative expenses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	(1)		0		0
Net long-duration insurance and contractholder liabilities measurement adjustments (1)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(256)		(765)		(832)
Shareholders other comprehensive income (loss), net of tax	(715)		509		67
Balance	(971)		(256)		(765)
Net long-duration insurance and contractholder liabilities measurement adjustments (1) | Previously Reported
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					0
Net long-duration insurance and contractholder liabilities measurement adjustments (1) | Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					(832)
Current period change in discount rate for certain long-duration liabilities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	(913)		642		59
Other comprehensive income (loss), before reclassifications, tax	222		(122)		(3)
Other comprehensive income (loss) before reclassifications, after-tax	(691)		520		56
Current period change in instrument-specific credit risk for market risk benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	(29)		(14)		13
Other comprehensive income (loss), before reclassifications, tax	5		3		(2)
Other comprehensive income (loss) before reclassifications, after-tax	(24)		(11)		11
Translation of foreign currencies including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) including temporary equity, before reclassifications, before tax	0		(277)		(213)
Other comprehensive income (loss) including temporary equity, before reclassifications, tax	5		(33)		(19)
Other comprehensive income (loss) including temporary equity, before reclassifications, after-tax	5		(310)		(232)
Reclassification adjustment, before tax	0		358		0
Reclassification adjustment, tax	0		29		0
Net amounts reclassified from AOCI to net income	0		387		0
Translation of foreign currencies, before tax	0		81		(213)
Other Comprehensive Income (Loss), Tax, Including Temporary Equity	5		(4)		(19)
Other comprehensive loss, net of tax	5		77		(232)
Translation of foreign currencies attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(154)		(233)		(15)
Shareholders other comprehensive income (loss), net of tax	5		79		(218)
Balance	(149)		(154)		(233)
Translation of foreign currencies attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Less: Net translation (loss) on foreign currencies attributable to noncontrolling interests	0		(2)		(14)
Postretirement benefits liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(916)		(1,336)		(1,746)
Other comprehensive income (loss) before reclassifications, before tax	(46)		487		448
Other comprehensive income (loss), before reclassifications, tax	12		(115)		(106)
Other comprehensive income (loss) before reclassifications, after-tax	(34)		372		342
Reclassification adjustment, tax	(11)		(16)		(21)
Net amounts reclassified from AOCI to net income	35		48		68
Shareholders other comprehensive income (loss), net of tax	1		420		410
Balance	(915)		(916)		(1,336)
Reclassification adjustment for amortization of net prior actuarial losses and prior service costs (Interest expense and other)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	46		65		85
Reclassification adjustment for (gains) included in Shareholders' net income ((Loss) gain on sale of businesses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	0		(1)		0
Reclassification adjustment for settlement (Interest expense and other)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	$ 0		$ 0		$ 4

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.