Equity - Schedule of OCI reclassification adjustments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	$ 5,550	$ (5,012)	$ 3,884	$ (3,226)
Less: Reclassification adjustments included in net income	(87)	(8)	(853)	(343)
Total other comprehensive income (loss), before income tax expense (benefit)	5,637	(5,004)	4,737	(2,883)
Less: Income tax expense (benefit)	1,004	(889)	1,118	(459)
Other comprehensive income (loss)	4,633	(4,115)	3,619	(2,424)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which allowance for credit losses was Taken
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(15)	(62)	10	14
Less: Reclassification adjustments included in net income	0	0	(8)	(17)
Total other comprehensive income (loss), before income tax expense (benefit)	(15)	(62)	18	31
Less: Income tax expense (benefit)	(3)	(13)	4	7
Other comprehensive income (loss)	(12)	(49)	14	24
Change in unrealized depreciation of investments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	6,769	(6,223)	3,521	(4,453)
Less: Reclassification adjustments included in net income	(87)	(8)	(1,024)	(326)
Total other comprehensive income (loss), before income tax expense (benefit)	6,856	(6,215)	4,545	(4,127)
Less: Income tax expense (benefit)	1,269	(1,157)	1,101	(717)
Other comprehensive income (loss)	5,587	(5,058)	3,444	(3,410)
Change in fair value of market risk benefits attributable to changes in our own credit risk
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(183)	(104)	(10)	(250)
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before income tax expense (benefit)	(183)	(104)	(10)	(250)
Less: Income tax expense (benefit)	(40)	(23)	(3)	(54)
Other comprehensive income (loss)	(143)	(81)	(7)	(196)
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(1,155)	1,435	258	1,468
Less: Reclassification adjustments included in net income	0	0	246	0
Total other comprehensive income (loss), before income tax expense (benefit)	(1,155)	1,435	12	1,468
Less: Income tax expense (benefit)	(251)	319	(6)	331
Other comprehensive income (loss)	(904)	1,116	18	1,137
Cash Flow Hedges
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	112	(17)	84	(32)
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before income tax expense (benefit)	112	(17)	84	(32)
Less: Income tax expense (benefit)	24	(3)	18	(8)
Other comprehensive income (loss)	88	(14)	66	(24)
Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	22	(41)	21	24
Less: Reclassification adjustments included in net income	0	0	(67)	0
Total other comprehensive income (loss), before income tax expense (benefit)	22	(41)	88	24
Less: Income tax expense (benefit)	5	(12)	4	(19)
Other comprehensive income (loss)	17	(29)	84	43
Retirement Plan Liabilities Adjustment
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	0	0	0	3
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before income tax expense (benefit)	0	0	0	3
Less: Income tax expense (benefit)	0	0	0	1
Other comprehensive income (loss)	$ 0	$ 0	$ 0	$ 2