Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 41,350	$ 44,518	$ 46,244	$ 44,688
Other comprehensive loss, net of tax	(118)	(109)	(578)	(220)
Less: Net translation (loss) on foreign currencies attributable to noncontrolling interests	0	0	0	0
Shareholders other comprehensive income (loss), net of tax	(118)	(109)	(578)	(220)
Balance	41,527	45,464	41,527	45,464
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,324)	(1,769)	(1,864)	(1,658)
Shareholders other comprehensive income (loss), net of tax	(118)	(109)	(578)	(220)
Balance	(2,442)	(1,878)	(2,442)	(1,878)
Securities and Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	292	(138)	171	(332)
Other comprehensive income (loss) before reclassifications, before tax	106	7	249	259
Other comprehensive income (loss), before reclassifications, tax	(29)	(12)	(68)	(66)
Other comprehensive income (loss) before reclassifications, after-tax	77	(5)	181	193
Reclassification adjustment, tax	(8)	(6)	(13)	(5)
Net amounts reclassified from AOCI to net income	31	25	48	21
Shareholders other comprehensive income (loss), net of tax	108	20	229	214
Balance	400	(118)	400	(118)
Reclassification adjustment for losses included in Shareholders' net income (Net realized investment (losses) gains)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	39	31	61	26
Net long-duration insurance and contractholder liabilities measurement adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,531)	(587)	(971)	(256)
Shareholders other comprehensive income (loss), net of tax	(212)	(117)	(772)	(448)
Balance	(1,743)	(704)	(1,743)	(704)
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	(288)	(147)	(1,020)	(558)
Other comprehensive income (loss), before reclassifications, tax	76	36	262	137
Other comprehensive income (loss) before reclassifications, after-tax	(212)	(111)	(758)	(421)
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	0	(7)	(18)	(33)
Other comprehensive income (loss), before reclassifications, tax	0	1	4	6
Other comprehensive income (loss) before reclassifications, after-tax	0	(6)	(14)	(27)
Translation of foreign currencies including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Translation of foreign currencies, before tax	(4)	(20)	(28)	(5)
Other Comprehensive Income (Loss), Tax, Including Temporary Equity	(1)	1	(3)	2
Translation of foreign currencies attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(175)	(138)	(149)	(154)
Shareholders other comprehensive income (loss), net of tax	(5)	(19)	(31)	(3)
Balance	(180)	(157)	(180)	(157)
Postretirement benefits liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(910)	(906)	(915)	(916)
Other comprehensive income (loss) before reclassifications, before tax	(20)	(2)	(20)	(2)
Other comprehensive income (loss), before reclassifications, tax	4	1	4	1
Other comprehensive income (loss) before reclassifications, after-tax	(16)	(1)	(16)	(1)
Reclassification adjustment, tax	0	(3)	(3)	(6)
Net amounts reclassified from AOCI to net income	7	8	12	18
Shareholders other comprehensive income (loss), net of tax	(9)	7	(4)	17
Balance	(919)	(899)	(919)	(899)
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	$ 7	$ 11	$ 15	$ 24