Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ 41,162	$ 42,550
Change in unrealized appreciation (depreciation) of investments	(735)	322
Change in other	(3)	6
Change in discount rates	5	9
Change in foreign currency translation adjustments	(119)	175
Change in net actuarial loss	7	8
Change in prior service cost	1
Change in deferred tax asset (liability)	116	116
Other comprehensive income (loss)	(728)	636
Balance, end of period	40,429	41,459
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(4,987)	(7,099)
Other comprehensive income (loss)	(728)	635
Balance, end of period	(5,715)	(6,464)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(3)	(4)
Balance, end of period	(4)	0
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(1,373)	(2,868)
Balance, end of period	(1,989)	(2,443)
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	87	68
Other comprehensive income (loss)	4	6
Balance, end of period	91	74
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(2,981)	(3,521)
Balance, end of period	(3,102)	(3,328)
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(717)	(774)
Balance, end of period	(711)	(767)
Less: Noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		1
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		0
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		0
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		0
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		1
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Noncontrolling interests		0
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in deferred tax asset (liability)	116	116
Other comprehensive income (loss)	(728)	636
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in unrealized appreciation (depreciation) of investments	(1)	4
Change in deferred tax asset (liability)	0	0
Other comprehensive income (loss)	(1)	4
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in unrealized appreciation (depreciation) of investments	(734)	318
Change in other	(3)	6
Change in deferred tax asset (liability)	121	101
Other comprehensive income (loss)	(616)	425
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in discount rates	5	9
Change in deferred tax asset (liability)	(1)	(3)
Other comprehensive income (loss)	4	6
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in foreign currency translation adjustments	(119)	175
Change in deferred tax asset (liability)	(2)	19
Other comprehensive income (loss)	(121)	194
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in net actuarial loss	7	8
Change in prior service cost	1
Change in deferred tax asset (liability)	(2)	(1)
Other comprehensive income (loss)	$ 6	$ 7