Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 83,395	$ 78,287
Fixed maturity securities, allowance for credit losses	6	11
Fixed maturity securities, gross unrealized gains	742	8,701
Fixed maturity securities, gross unrealized losses	9,374	450
Fixed maturity securities, estimated fair value	74,757	86,527
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	36,399	34,773
Fixed maturity securities, allowance for credit losses	1	2
Fixed maturity securities, gross unrealized gains	200	3,890
Fixed maturity securities, gross unrealized losses	4,436	187
Fixed maturity securities, estimated fair value	32,162	38,474
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	12,368	10,813
Fixed maturity securities, allowance for credit losses	1	7
Fixed maturity securities, gross unrealized gains	37	902
Fixed maturity securities, gross unrealized losses	1,912	103
Fixed maturity securities, estimated fair value	10,492	11,605
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,195	7,188
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	299	2,040
Fixed maturity securities, gross unrealized losses	596	60
Fixed maturity securities, estimated fair value	7,898	9,168
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,384	8,838
Fixed maturity securities, allowance for credit losses	1	0
Fixed maturity securities, gross unrealized gains	44	433
Fixed maturity securities, gross unrealized losses	936	51
Fixed maturity securities, estimated fair value	7,491	9,220
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	7,239	6,890
Fixed maturity securities, allowance for credit losses	3	2
Fixed maturity securities, gross unrealized gains	0	329
Fixed maturity securities, gross unrealized losses	699	24
Fixed maturity securities, estimated fair value	6,537	7,193
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	4,015	3,937
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	120	829
Fixed maturity securities, gross unrealized losses	394	6
Fixed maturity securities, estimated fair value	3,741	4,760
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	5,647	4,255
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	3	34
Fixed maturity securities, gross unrealized losses	295	14
Fixed maturity securities, estimated fair value	5,355	4,275
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	1,148	1,593
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	39	244
Fixed maturity securities, gross unrealized losses	106	5
Fixed maturity securities, estimated fair value	$ 1,081	$ 1,832

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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