Equity - Schedule of Other Comprehensive Income (Loss) Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reclassification of significant items out of Accumulated Other Comprehensive Income
Less: Income tax expense (benefit)	$ (116)	$ (116)
Other comprehensive income (loss)	(728)	636
AOCI Including Portion Attributable to Noncontrolling Interest
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	(982)	250
Less: Reclassification adjustments included in net income	(138)	(270)
Total other comprehensive income (loss), before of income tax expense (benefit)	(844)	520
Less: Income tax expense (benefit)	(116)	(116)
Other comprehensive income (loss)	(728)	636
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	(1)	4
Less: Reclassification adjustments included in net income	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(1)	4
Less: Income tax expense (benefit)	0	0
Other comprehensive income (loss)	(1)	4
Unrealized Appreciation (Depreciation) of All Other Investments
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	(867)	62
Less: Reclassification adjustments included in net income	(130)	(262)
Total other comprehensive income (loss), before of income tax expense (benefit)	(737)	324
Less: Income tax expense (benefit)	(121)	(101)
Other comprehensive income (loss)	(616)	425
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	5	9
Less: Reclassification adjustments included in net income	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	5	9
Less: Income tax expense (benefit)	1	3
Other comprehensive income (loss)	4	6
Foreign Currency Translation Adjustments
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	(119)	175
Less: Reclassification adjustments included in net income	0	0
Total other comprehensive income (loss), before of income tax expense (benefit)	(119)	175
Less: Income tax expense (benefit)	2	(19)
Other comprehensive income (loss)	(121)	194
Retirement Plan Liabilities Adjustment
Reclassification of significant items out of Accumulated Other Comprehensive Income
Unrealized change arising during period	0	0
Less: Reclassification adjustments included in net income	(8)	(8)
Total other comprehensive income (loss), before of income tax expense (benefit)	8	8
Less: Income tax expense (benefit)	2	1
Other comprehensive income (loss)	$ 6	$ 7