Equity - Schedule of other comprehensive income (loss) reclassification adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Comprehensive Income (Loss) Reclassification Adjustments
Other comprehensive income (loss)	$ 5,940	$ (32,303)	$ (5,424)
Noncontrolling interests
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	5,681	(39,179)	(5,762)
Less: Reclassification adjustments included in net income	(1,091)	(1,212)	882
Total other comprehensive income (loss), before of income tax expense (benefit)	6,772	(37,967)	(6,644)
Less: Income tax expense (benefit)	832	(5,664)	(1,220)
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	(6)	(112)	55
Less: Reclassification adjustments included in net income	(26)	7	0
Total other comprehensive income (loss), before of income tax expense (benefit)	20	(119)	55
Less: Income tax expense (benefit)	6	(25)	11
Other comprehensive income (loss)	14	(94)	44
Unrealized Appreciation (Depreciation) of All Other Investments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	7,172	(47,043)	(8,030)
Less: Reclassification adjustments included in net income	(1,036)	(1,189)	928
Total other comprehensive income (loss), before of income tax expense (benefit)	8,208	(45,854)	(8,958)
Less: Income tax expense (benefit)	1,074	(7,446)	(1,807)
Other comprehensive income (loss)	7,134	(38,408)	(7,151)
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	(695)	1,635	227
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(695)	1,635	227
Less: Income tax expense (benefit)	(151)	341	48
Other comprehensive income (loss)	(544)	1,294	179
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	(1,045)	6,993	1,717
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(1,045)	6,993	1,717
Less: Income tax expense (benefit)	(174)	1,449	356
Other comprehensive income (loss)	(871)	5,544	1,361
Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	137	(593)	(108)
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	137	(593)	(108)
Less: Income tax expense (benefit)	35	20	72
Other comprehensive income (loss)	102	(613)	(180)
Retirement Plan Liabilities Adjustment
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	118	(53)	379
Less: Reclassification adjustments included in net income	(29)	(30)	(46)
Total other comprehensive income (loss), before of income tax expense (benefit)	147	(23)	425
Less: Income tax expense (benefit)	42	(3)	100
Other comprehensive income (loss)	105	(20)	325
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	(6)	(2)
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	0	(6)	(2)
Less: Income tax expense (benefit)	0	0	0
Other comprehensive income (loss)	$ 0	$ (6)	$ (2)