Accumulated Other Comprehensive Income (Loss) - Reconciliation of the Components of Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income attributable to noncontrolling interests, tax	$ 0	$ 1	$ 1
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	(212)	(42)	(362)
Net unrealized investment gains (losses):
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	(163)	44	(218)
Reclassification from AOCI, current period, tax	(31)	(82)	(113)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income attributable to noncontrolling interests, tax	0	1	1
Non-credit components of impairments on investments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	1	(1)	0
Net cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	(4)	(4)	6
Pension and other benefits:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	(16)	0	(39)
Future policy benefits:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	1	1	1
Foreign currency translation adjustments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit	$ 0	$ 0	$ 1