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	$ 87,206	$ 87,046
Fixed maturity securities, allowance for credit losses	65	64	$ 56	$ 81
Fixed maturity securities, gross unrealized gains	645	963
Fixed maturity securities, gross unrealized losses	6,554	5,931
Fixed maturity securities, at estimated fair value	81,232	82,014
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	41,570	41,590
Fixed maturity securities, allowance for credit losses	33	27	21	47
Fixed maturity securities, gross unrealized gains	288	443
Fixed maturity securities, gross unrealized losses	3,489	3,097
Fixed maturity securities, at estimated fair value	38,336	38,909
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	12,162	12,380
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	1,128	997
Fixed maturity securities, at estimated fair value	11,103	11,497
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	9,426	9,029
Fixed maturity securities, allowance for credit losses	3	3	4	4
Fixed maturity securities, gross unrealized gains	68	85
Fixed maturity securities, gross unrealized losses	612	579
Fixed maturity securities, at estimated fair value	8,879	8,532
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	7,248	7,216
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	63	105
Fixed maturity securities, gross unrealized losses	648	610
Fixed maturity securities, at estimated fair value	6,663	6,711
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,149	6,081
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	54	55
Fixed maturity securities, at estimated fair value	6,102	6,059
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,072	6,086
Fixed maturity securities, allowance for credit losses	2	3	$ 2	$ 4
Fixed maturity securities, gross unrealized gains	6	13
Fixed maturity securities, gross unrealized losses	236	226
Fixed maturity securities, at estimated fair value	5,840	5,870
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	3,633	3,691
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	89	103
Fixed maturity securities, gross unrealized losses	308	300
Fixed maturity securities, at estimated fair value	3,414	3,494
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	946	973
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	28	36
Fixed maturity securities, gross unrealized losses	79	67
Fixed maturity securities, at estimated fair value	$ 895	$ 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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