Equity - Schedule of other comprehensive income (loss) reclassification adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Comprehensive Income (Loss) Reclassification Adjustments
Other comprehensive income (loss)	$ (33,402)	$ (5,830)	$ 8,513
Noncontrolling interests
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(40,572)	(6,279)	11,771
Less: Reclassification adjustments included in net income	(1,212)	882	969
Total other comprehensive income (loss), before of income tax expense (benefit)	(39,360)	(7,161)	10,802
Less: Income tax expense (benefit)	(5,958)	(1,331)	2,289
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	(103)	44	(161)
Less: Reclassification adjustments included in net income	7	0	(39)
Total other comprehensive income (loss), before of income tax expense (benefit)	(110)	44	(122)
Less: Income tax expense (benefit)	(23)	9	(27)
Other comprehensive income (loss)	(87)	35	(95)
Unrealized Appreciation (Depreciation) of All Other Investments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(39,940)	(6,583)	11,758
Less: Reclassification adjustments included in net income	(1,189)	928	1,053
Total other comprehensive income (loss), before of income tax expense (benefit)	(38,751)	(7,511)	10,705
Less: Income tax expense (benefit)	(5,976)	(1,510)	2,351
Other comprehensive income (loss)	(32,775)	(6,001)	8,354
Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(470)	(117)	303
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(470)	(117)	303
Less: Income tax expense (benefit)	44	70	(56)
Other comprehensive income (loss)	(514)	(187)	359
Retirement Plan Liabilities Adjustment
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(53)	379	(130)
Less: Reclassification adjustments included in net income	(30)	(46)	(45)
Total other comprehensive income (loss), before of income tax expense (benefit)	(23)	425	(85)
Less: Income tax expense (benefit)	(3)	100	21
Other comprehensive income (loss)	(20)	325	(106)
Fair Value of Liabilities Under Fair Value Option Attributable to Changes in Own Credit Risk
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(6)	(2)	1
Less: Reclassification adjustments included in net income	0	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(6)	(2)	1
Less: Income tax expense (benefit)	0	0	0
Other comprehensive income (loss)	$ (6)	$ (2)	$ 1