Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 277,736	$ 281,412
Equity securities	754	757
Unit-linked and FVO securities	10,106	10,331
Short-term investments	3,804	6,045
Derivative assets	8,241	8,737
Market risk benefits, at estimated fair value	356	286
Separate account assets	139,707	144,634
Liabilities [Abstract]
Derivative liabilities	7,347	6,298
Embedded derivatives within liability host contracts	55	93
Market risk benefits, at estimated fair value	2,618	3,179
Separate account liabilities	139,707	144,634
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	277,736	281,412
Equity securities	754	757
Unit-linked and FVO securities	10,106	10,331
Short-term investments	3,529	5,797
Other investments	1,630	1,386
Derivative assets	8,241	8,737
Market risk benefits, at estimated fair value	356	286
Reinsured MRB Assets	11	18
Separate account assets	139,707	144,634
Total assets	442,070	453,358
Investments, fair value	52	52
Liabilities [Abstract]
Derivative liabilities	7,347	6,298
Embedded derivatives within liability host contracts	55	93
Market risk benefits, at estimated fair value	2,618	3,179
Total liabilities	10,023	9,578
Recurring | Interest rate
Assets [Abstract]
Derivative assets	3,143	3,675
Liabilities [Abstract]
Derivative liabilities	3,519	2,984
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,536	4,418
Liabilities [Abstract]
Derivative liabilities	3,391	2,744
Recurring | Credit
Assets [Abstract]
Derivative assets	254	236
Liabilities [Abstract]
Derivative liabilities	77	84
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	308	408
Liabilities [Abstract]
Derivative liabilities	360	486
Recurring | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	3	8
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	80,678	80,717
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	53,419	55,444
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	40,054	45,489
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	33,238	32,252
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	32,616	29,096
Recurring | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,775	17,294
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,470	11,171
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,486	9,949
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,700	15,330
Equity securities	415	429
Unit-linked and FVO securities	7,397	7,520
Short-term investments	2,389	5,103
Other investments	42	48
Derivative assets	14	11
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	64,100	66,229
Total assets	91,057	94,670
Liabilities [Abstract]
Derivative liabilities	10	16
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	10	20
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	4	1
Liabilities [Abstract]
Derivative liabilities	3	5
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	0	2
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	10	8
Liabilities [Abstract]
Derivative liabilities	7	11
Recurring | Level 1 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	0	4
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	16,700	15,327
Recurring | Level 1 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	3
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	225,888	233,135
Equity securities	77	79
Unit-linked and FVO securities	1,613	1,708
Short-term investments	1,130	667
Other investments	515	363
Derivative assets	8,207	8,688
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	74,485	77,258
Total assets	311,915	321,898
Liabilities [Abstract]
Derivative liabilities	7,242	6,101
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	7,245	6,105
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	3,139	3,674
Liabilities [Abstract]
Derivative liabilities	3,434	2,805
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,523	4,393
Liabilities [Abstract]
Derivative liabilities	3,378	2,737
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	254	228
Liabilities [Abstract]
Derivative liabilities	77	84
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	291	393
Liabilities [Abstract]
Derivative liabilities	353	475
Recurring | Level 2 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	3	4
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	66,333	67,003
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	38,524	40,813
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	40,014	45,438
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,538	16,925
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	30,428	27,495
Recurring | Level 2 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,172	15,191
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,469	11,171
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	8,410	9,099
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	35,148	32,947
Equity securities	262	249
Unit-linked and FVO securities	1,096	1,103
Short-term investments	10	27
Other investments	1,073	975
Derivative assets	20	38
Market risk benefits, at estimated fair value	356	286
Reinsured MRB Assets	11	18
Separate account assets	1,122	1,147
Total assets	39,098	36,790
Liabilities [Abstract]
Derivative liabilities	95	181
Embedded derivatives within liability host contracts	55	93
Market risk benefits, at estimated fair value	2,618	3,179
Total liabilities	2,768	3,453
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	82	174
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	13	23
Liabilities [Abstract]
Derivative liabilities	13	7
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	0	8
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Equity market contracts
Assets [Abstract]
Derivative assets	7	7
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	0	0
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,345	13,714
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,895	14,631
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	40	51
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	2,188	1,598
Recurring | Level 3 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2,603	2,103
Recurring | Level 3 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	1	0
Recurring | Level 3 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 1,076	$ 850