Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Jan. 01, 2021	Dec. 31, 2020
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 270,982	$ 276,780
Equity securities	742	1,684
Unit-linked and FVO Securities (1)	9,680	9,668
Short-term investments (2)	6,497	4,935
Derivative assets	9,466	11,411
Market risk benefits	334	280
Reinsured MRB Assets			$ 51	$ 0
Separate account assets	135,624	146,038
Liabilities [Abstract]
Derivative liabilities	7,406	6,975
Embedded derivatives within liability host contracts	5	17
Market risk benefits	2,738	3,763	$ 7,901
Separate account liabilities	135,624	146,038
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	270,982	276,780
Equity securities	742	1,684
Unit-linked and FVO Securities (1)	9,680	9,668
Short-term investments (2)	6,237	4,573
Other investments	1,332	1,132
Derivative assets	9,466	11,411
Market risk benefits	334	280
Reinsured MRB Assets	18	23
Separate account assets	135,624	146,038
Total assets (6)	434,415	451,589
Liabilities [Abstract]
Derivative liabilities	7,406	6,975
Embedded derivatives within liability host contracts	5	17
Market risk benefits	2,738	3,763
Total liabilities	10,162	10,796
Recurring | Interest rate
Assets [Abstract]
Derivative assets	3,618	4,572
Liabilities [Abstract]
Derivative liabilities	3,924	3,558
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,996	5,888
Liabilities [Abstract]
Derivative liabilities	3,137	2,870
Recurring | Credit
Assets [Abstract]
Derivative assets	177	151
Liabilities [Abstract]
Derivative liabilities	94	107
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	675	800
Liabilities [Abstract]
Derivative liabilities	251	440
Recurring | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	13	41
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	78,552	80,030
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	51,377	52,572
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	42,685	46,747
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	31,729	32,229
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	27,785	26,165
Recurring | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,412	16,822
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,347	12,152
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,095	10,063
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,256	15,959
Equity securities	406	1,293
Unit-linked and FVO Securities (1)	7,054	7,101
Short-term investments (2)	5,451	3,830
Other investments	0	0
Derivative assets	12	18
Market risk benefits	0	0
Reinsured MRB Assets	0	0
Separate account assets	61,249	65,107
Total assets (6)	90,428	93,308
Liabilities [Abstract]
Derivative liabilities	5	5
Embedded derivatives within liability host contracts	0	0
Market risk benefits	0	0
Total liabilities	12	13
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	3	2
Liabilities [Abstract]
Derivative liabilities	1	1
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	0	8
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | Credit
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | Equity market contracts
Assets [Abstract]
Derivative assets	9	8
Liabilities [Abstract]
Derivative liabilities	4	4
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	7	8
Recurring | Level 1 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,204	15,955
Recurring | Level 1 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	52	4
Recurring | Level 1 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 2
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	224,511	232,048
Equity securities	92	132
Unit-linked and FVO Securities (1)	1,557	1,780
Short-term investments (2)	761	686
Other investments	362	206
Derivative assets	9,422	11,094
Market risk benefits	0	0
Reinsured MRB Assets	0	0
Separate account assets	73,167	79,703
Total assets (6)	309,872	325,649
Liabilities [Abstract]
Derivative liabilities	7,080	6,501
Embedded derivatives within liability host contracts	0	0
Market risk benefits	0	0
Total liabilities	7,085	6,516
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	3,615	4,570
Liabilities [Abstract]
Derivative liabilities	3,615	3,153
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,978	5,670
Liabilities [Abstract]
Derivative liabilities	3,124	2,820
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	170	69
Liabilities [Abstract]
Derivative liabilities	94	92
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	659	785
Liabilities [Abstract]
Derivative liabilities	247	436
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	5	15
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	65,883	67,578
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	38,779	40,623
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	42,642	46,644
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,525	16,274
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	25,783	24,515
Recurring | Level 2 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,221	14,895
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,347	12,152
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,331	9,367
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	30,215	28,773
Equity securities	244	259
Unit-linked and FVO Securities (1)	1,069	787
Short-term investments (2)	25	57
Other investments	970	926
Derivative assets	32	299
Market risk benefits	334	280
Reinsured MRB Assets	18	23
Separate account assets	1,208	1,228
Total assets (6)	34,115	32,632
Liabilities [Abstract]
Derivative liabilities	321	469
Embedded derivatives within liability host contracts	5	17
Market risk benefits	2,738	3,763
Total liabilities	3,065	4,267
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	308	404
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	18	210
Liabilities [Abstract]
Derivative liabilities	13	50
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	7	82
Liabilities [Abstract]
Derivative liabilities	0	15
Recurring | Level 3 | Equity market contracts
Assets [Abstract]
Derivative assets	7	7
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	1	18
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	12,669	12,452
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	12,598	11,949
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	43	103
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 3 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	1,950	1,646
Recurring | Level 3 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2,191	1,927
Recurring | Level 3 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 3 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	764	696
OLPI | Recurring
Assets [Abstract]
Investments, Fair Value Disclosure	$ 58	$ 65