Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 85,662	$ 86,565
Fixed maturity securities, allowance for credit losses	65	79	$ 43	$ 21
Fixed maturity securities, gross unrealized gains	778	491
Fixed maturity securities, gross unrealized losses	6,544	7,848
Fixed maturity securities, estimated fair value	79,831	79,129
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	40,140	40,437
Fixed maturity securities, allowance for credit losses	26	47	31	15
Fixed maturity securities, gross unrealized gains	345	212
Fixed maturity securities, gross unrealized losses	3,371	3,865
Fixed maturity securities, estimated fair value	37,088	36,737
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	12,685	13,203
Fixed maturity securities, allowance for credit losses	35	26	4	0
Fixed maturity securities, gross unrealized gains	126	53
Fixed maturity securities, gross unrealized losses	1,077	1,468
Fixed maturity securities, estimated fair value	11,699	11,762
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,421	8,056
Fixed maturity securities, allowance for credit losses	3	4	5	4
Fixed maturity securities, gross unrealized gains	62	45
Fixed maturity securities, gross unrealized losses	699	867
Fixed maturity securities, estimated fair value	7,781	7,230
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,935	7,112
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	83	39
Fixed maturity securities, gross unrealized losses	625	691
Fixed maturity securities, estimated fair value	6,393	6,460
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,200	6,348
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	36	33
Fixed maturity securities, gross unrealized losses	65	75
Fixed maturity securities, estimated fair value	6,171	6,306
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,590	6,702
Fixed maturity securities, allowance for credit losses	1	2	$ 3	$ 2
Fixed maturity securities, gross unrealized gains	11	7
Fixed maturity securities, gross unrealized losses	292	415
Fixed maturity securities, estimated fair value	6,308	6,292
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	3,704	3,671
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	84	78
Fixed maturity securities, gross unrealized losses	338	367
Fixed maturity securities, estimated fair value	3,450	3,382
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	987	1,036
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	31	24
Fixed maturity securities, gross unrealized losses	77	100
Fixed maturity securities, estimated fair value	$ 941	$ 960

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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