Equity - Schedule of other comprehensive income (loss) reclassification adjustments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss) Reclassification Adjustments
Other comprehensive income (loss)	$ (4,918)	$ (8,306)	$ (2,743)	$ (34,034)
Noncontrolling interests
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(5,934)	(10,027)	(4,113)	(40,706)
Less: Reclassification adjustments included in net income	(169)	(139)	(979)	(897)
Total other comprehensive income (loss), before of income tax expense (benefit)	(5,765)	(9,888)	(3,134)	(39,809)
Less: Income tax expense (benefit)	(847)	(1,582)	(391)	(5,775)
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	(80)	(77)	10	(98)
Less: Reclassification adjustments included in net income	0	17	(23)	9
Total other comprehensive income (loss), before of income tax expense (benefit)	(80)	(94)	33	(107)
Less: Income tax expense (benefit)	(14)	(20)	9	(24)
Other comprehensive income (loss)	(66)	(74)	24	(83)
Unrealized Appreciation (Depreciation) of All Other Investments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(6,998)	(11,700)	(5,171)	(49,047)
Less: Reclassification adjustments included in net income	(163)	(148)	(933)	(883)
Total other comprehensive income (loss), before of income tax expense (benefit)	(6,835)	(11,552)	(4,238)	(48,164)
Less: Income tax expense (benefit)	(1,141)	(2,048)	(798)	(7,737)
Other comprehensive income (loss)	(5,694)	(9,504)	(3,440)	(40,427)
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	(104)	320	(250)	2,048
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(104)	320	(250)	2,048
Less: Income tax expense (benefit)	(23)	67	(54)	431
Other comprehensive income (loss)	(81)	253	(196)	1,617
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	1,470	2,168	1,474	7,403
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	1,470	2,168	1,474	7,403
Less: Income tax expense (benefit)	323	443	374	1,518
Other comprehensive income (loss)	1,147	1,725	1,100	5,885
Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(279)	(748)	(323)	(1,024)
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(279)	(748)	(323)	(1,024)
Less: Income tax expense (benefit)	(10)	(27)	33	38
Other comprehensive income (loss)	(269)	(721)	(356)	(1,062)
Retirement Plan Liabilities Adjustment
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	57	10	147	16
Less: Reclassification adjustments included in net income	(6)	(8)	(23)	(23)
Total other comprehensive income (loss), before of income tax expense (benefit)	63	18	170	39
Less: Income tax expense (benefit)	18	3	45	(1)
Other comprehensive income (loss)	45	15	125	40
Fair Value of Liabilities Under Fair Value Option Attributable to Changes in Our Own Credit Risk
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	0	0	0	(4)
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	0	0	0	(4)
Less: Income tax expense (benefit)	0	0	0	0
Other comprehensive income (loss)	$ 0	$ 0	$ 0	$ (4)