Equity - Other comprehensive income reclassification adjustments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other Comprehensive Income (Loss) Reclassification Adjustments
Other comprehensive loss	$ (8,973)	$ (1,602)	$ (35,388)	$ (4,905)
Noncontrolling interests
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(10,869)	(1,738)	(42,425)	(5,366)
Less: Reclassification adjustments included in net income	(139)	214	(897)	715
Total other comprehensive income (loss), before income tax expense (benefit)	(10,730)	(1,952)	(41,528)	(6,081)
Less: Income tax expense (benefit)	(1,757)	(350)	(6,140)	(1,176)
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	(75)	21	(91)	62
Less: Reclassification adjustments included in net income	17	6	9	0
Total other comprehensive income (loss), before income tax expense (benefit)	(92)	15	(100)	62
Less: Income tax expense (benefit)	(19)	3	(22)	13
Other comprehensive loss	(73)	12	(78)	49
Unrealized Appreciation (Depreciation) of All Other Investments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(10,215)	(1,657)	(41,552)	(5,512)
Less: Reclassification adjustments included in net income	(148)	219	(883)	749
Total other comprehensive income (loss), before income tax expense (benefit)	(10,067)	(1,876)	(40,669)	(6,261)
Less: Income tax expense (benefit)	(1,743)	(366)	(6,200)	(1,262)
Other comprehensive loss	(8,324)	(1,510)	(34,469)	(4,999)
Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	(589)	(132)	(794)	63
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before income tax expense (benefit)	(589)	(132)	(794)	63
Less: Income tax expense (benefit)	2	3	83	59
Other comprehensive loss	(591)	(135)	(877)	4
Retirement Plan Liabilities Adjustment
Other Comprehensive Income (Loss) Reclassification Adjustments
Unrealized change arising during period	10	30	16	22
Less: Reclassification adjustments included in net income	(8)	(11)	(23)	(34)
Total other comprehensive income (loss), before income tax expense (benefit)	18	41	39	56
Less: Income tax expense (benefit)	3	10	(1)	14
Other comprehensive loss	15	31	40	42
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	0	0	(4)	(1)
Less: Reclassification adjustments included in net income	0	0	0	0
Total other comprehensive income (loss), before income tax expense (benefit)	0	0	(4)	(1)
Less: Income tax expense (benefit)	0	0	0	0
Other comprehensive loss	$ 0	$ 0	$ (4)	$ (1)