Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 86,021	$ 85,907
Fixed maturity securities, allowance for credit losses	64	62	$ 54	$ 79
Fixed maturity securities, gross unrealized gains	637	951
Fixed maturity securities, gross unrealized losses	6,451	5,836
Fixed maturity securities, at estimated fair value	80,143	80,960
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	41,011	41,030
Fixed maturity securities, allowance for credit losses	33	27	21	47
Fixed maturity securities, gross unrealized gains	284	437
Fixed maturity securities, gross unrealized losses	3,417	3,031
Fixed maturity securities, at estimated fair value	37,845	38,409
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	12,102	12,311
Fixed maturity securities, allowance for credit losses	17	31	29	26
Fixed maturity securities, gross unrealized gains	86	145
Fixed maturity securities, gross unrealized losses	1,122	991
Fixed maturity securities, at estimated fair value	11,049	11,434
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	9,366	8,967
Fixed maturity securities, allowance for credit losses	3	3	3	4
Fixed maturity securities, gross unrealized gains	67	83
Fixed maturity securities, gross unrealized losses	605	571
Fixed maturity securities, at estimated fair value	8,825	8,476
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,917	6,942
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	63	104
Fixed maturity securities, gross unrealized losses	639	601
Fixed maturity securities, at estimated fair value	6,341	6,445
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,120	6,054
Fixed maturity securities, allowance for credit losses	10	0	0	0
Fixed maturity securities, gross unrealized gains	17	33
Fixed maturity securities, gross unrealized losses	53	56
Fixed maturity securities, at estimated fair value	6,074	6,031
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	5,996	6,009
Fixed maturity securities, allowance for credit losses	1	1	$ 1	$ 2
Fixed maturity securities, gross unrealized gains	6	14
Fixed maturity securities, gross unrealized losses	231	222
Fixed maturity securities, at estimated fair value	5,770	5,800
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	3,562	3,620
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	86	100
Fixed maturity securities, gross unrealized losses	305	297
Fixed maturity securities, at estimated fair value	3,343	3,423
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	947	974
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	28	35
Fixed maturity securities, gross unrealized losses	79	67
Fixed maturity securities, at estimated fair value	$ 896	$ 942

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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