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Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 84,693	$ 84,344
Fixed maturity securities, allowance for credit losses	5	7
Fixed maturity securities, gross unrealized gains	1,130	752
Fixed maturity securities, gross unrealized losses	8,133	9,512
Fixed maturity securities, estimated fair value	77,685	75,577
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	37,171	36,926
Fixed maturity securities, allowance for credit losses	0	1
Fixed maturity securities, gross unrealized gains	320	203
Fixed maturity securities, gross unrealized losses	3,879	4,521
Fixed maturity securities, estimated fair value	33,612	32,607
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	12,465	12,471
Fixed maturity securities, allowance for credit losses	0	1
Fixed maturity securities, gross unrealized gains	56	38
Fixed maturity securities, gross unrealized losses	1,638	1,932
Fixed maturity securities, estimated fair value	10,883	10,576
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,310	8,318
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	472	300
Fixed maturity securities, gross unrealized losses	495	602
Fixed maturity securities, estimated fair value	8,287	8,016
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,357	8,431
Fixed maturity securities, allowance for credit losses	2	2
Fixed maturity securities, gross unrealized gains	46	44
Fixed maturity securities, gross unrealized losses	811	945
Fixed maturity securities, estimated fair value	7,590	7,528
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	7,343	7,324
Fixed maturity securities, allowance for credit losses	3	3
Fixed maturity securities, gross unrealized gains	0	0
Fixed maturity securities, gross unrealized losses	666	710
Fixed maturity securities, estimated fair value	6,674	6,611
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	4,072	4,074
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	178	125
Fixed maturity securities, gross unrealized losses	301	400
Fixed maturity securities, estimated fair value	3,949	3,799
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	5,835	5,652
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	9	3
Fixed maturity securities, gross unrealized losses	248	296
Fixed maturity securities, estimated fair value	5,596	5,359
Foreign Government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	1,140	1,148
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	49	39
Fixed maturity securities, gross unrealized losses	95	106
Fixed maturity securities, estimated fair value	$ 1,094	$ 1,081

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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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