Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 278,409	$ 281,412
Equity securities	750	757
Unit-linked and FVO securities	10,313	10,331
Short-term investments	4,884	6,045
Derivative assets	8,291	8,737
Market risk benefits	351	286
Separate account assets	141,003	144,634
Liabilities [Abstract]
Derivative liabilities	6,985	6,298
Embedded derivatives within liability host contracts	62	93
Market risk benefits	2,696	3,179
Separate account liabilities	141,003	144,634
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	278,409	281,412
Equity securities	750	757
Unit-linked and FVO securities	10,313	10,331
Short-term investments	4,636	5,797
Other investments	1,648	1,386
Derivative assets	8,291	8,737
Market risk benefits	351	286
Reinsured MRB Assets	13	18
Separate account assets	141,003	144,634
Total assets	445,414	453,358
Investments, fair value	56	52
Liabilities [Abstract]
Derivative liabilities	6,985	6,298
Embedded derivatives within liability host contracts	62	93
Market risk benefits	2,696	3,179
Total liabilities	9,747	9,578
Recurring | Interest rate
Assets [Abstract]
Derivative assets	3,262	3,675
Liabilities [Abstract]
Derivative liabilities	3,164	2,984
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,427	4,418
Liabilities [Abstract]
Derivative liabilities	3,335	2,744
Recurring | Credit
Assets [Abstract]
Derivative assets	271	236
Liabilities [Abstract]
Derivative liabilities	90	84
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	331	408
Liabilities [Abstract]
Derivative liabilities	396	486
Recurring | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	4	8
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	80,553	80,717
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	54,029	55,444
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	42,793	45,489
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	31,848	32,252
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	31,142	29,096
Recurring | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,468	17,294
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,938	11,171
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,638	9,949
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,406	15,330
Equity securities	435	429
Unit-linked and FVO securities	7,512	7,520
Short-term investments	3,433	5,103
Other investments	47	48
Derivative assets	6	11
Market risk benefits	0	0
Reinsured MRB Assets	0	0
Separate account assets	62,866	66,229
Total assets	89,705	94,670
Liabilities [Abstract]
Derivative liabilities	7	16
Embedded derivatives within liability host contracts	0	0
Market risk benefits	0	0
Total liabilities	8	20
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	1	1
Liabilities [Abstract]
Derivative liabilities	1	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	5	8
Liabilities [Abstract]
Derivative liabilities	6	11
Recurring | Level 1 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	1	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	15,402	15,327
Recurring | Level 1 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	4	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	229,178	233,135
Equity securities	62	79
Unit-linked and FVO securities	1,708	1,708
Short-term investments	1,189	667
Other investments	430	363
Derivative assets	8,262	8,688
Market risk benefits	0	0
Reinsured MRB Assets	0	0
Separate account assets	76,995	77,258
Total assets	317,824	321,898
Liabilities [Abstract]
Derivative liabilities	6,816	6,101
Embedded derivatives within liability host contracts	0	0
Market risk benefits	0	0
Total liabilities	6,819	6,105
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	3,261	3,674
Liabilities [Abstract]
Derivative liabilities	3,030	2,805
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,419	4,393
Liabilities [Abstract]
Derivative liabilities	3,309	2,737
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	263	228
Liabilities [Abstract]
Derivative liabilities	87	84
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	319	393
Liabilities [Abstract]
Derivative liabilities	390	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	66,545	67,003
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	39,534	40,813
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	42,748	45,438
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,446	16,925
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	29,030	27,495
Recurring | Level 2 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,273	15,191
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,938	11,171
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	8,664	9,099
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	33,825	32,947
Equity securities	253	249
Unit-linked and FVO securities	1,093	1,103
Short-term investments	14	27
Other investments	1,171	975
Derivative assets	23	38
Market risk benefits	351	286
Reinsured MRB Assets	13	18
Separate account assets	1,142	1,147
Total assets	37,885	36,790
Liabilities [Abstract]
Derivative liabilities	162	181
Embedded derivatives within liability host contracts	62	93
Market risk benefits	2,696	3,179
Total liabilities	2,920	3,453
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	133	174
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	8	23
Liabilities [Abstract]
Derivative liabilities	26	7
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	8	8
Liabilities [Abstract]
Derivative liabilities	3	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	14,008	13,714
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,495	14,631
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	45	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	2,108	1,598
Recurring | Level 3 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2,195	2,103
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	$ 974	$ 850