Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 293,779	$ 281,412
Equity securities	746	757
Unit-linked and FVO securities	9,289	10,331
Short-term investments	4,609	6,045
Derivative assets	8,172	8,737
Market risk benefits, at estimated fair value	310	286
Separate account assets	148,809	144,634
Liabilities [Abstract]
Derivative liabilities	6,357	6,298
Embedded derivatives within liability host contracts	119	93
Market risk benefits, at estimated fair value	3,117	3,179
Separate account liabilities	148,809	144,634
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	293,779	281,412
Equity securities	746	757
Unit-linked and FVO securities	9,289	10,331
Short-term investments	4,337	5,797
Other investments	3,155	1,386
Derivative assets	8,172	8,737
Market risk benefits, at estimated fair value	310	286
Reinsured MRB Assets	16	18
Separate account assets	148,809	144,634
Total assets	468,613	453,358
Investments, fair value	51	52
Liabilities [Abstract]
Derivative liabilities	6,357	6,298
Embedded derivatives within liability host contracts	119	93
Market risk benefits, at estimated fair value	3,117	3,179
Total liabilities	9,598	9,578
Recurring | Interest rate
Assets [Abstract]
Derivative assets	3,426	3,675
Liabilities [Abstract]
Derivative liabilities	2,996	2,984
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,186	4,418
Liabilities [Abstract]
Derivative liabilities	2,923	2,744
Recurring | Credit
Assets [Abstract]
Derivative assets	271	236
Liabilities [Abstract]
Derivative liabilities	76	84
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	289	408
Liabilities [Abstract]
Derivative liabilities	362	486
Recurring | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	5	8
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	84,851	80,717
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	56,752	55,444
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	44,132	45,489
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	34,676	32,252
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	35,264	29,096
Recurring | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,520	17,294
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,798	11,171
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,786	9,949
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,650	15,330
Equity securities	430	429
Unit-linked and FVO securities	7,846	7,520
Short-term investments	3,155	5,103
Other investments	44	48
Derivative assets	17	11
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	69,799	66,229
Total assets	97,941	94,670
Liabilities [Abstract]
Derivative liabilities	8	16
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	8	20
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	2	1
Liabilities [Abstract]
Derivative liabilities	2	5
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2	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	13	8
Liabilities [Abstract]
Derivative liabilities	6	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	16,650	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	241,373	233,135
Equity securities	74	79
Unit-linked and FVO securities	267	1,708
Short-term investments	1,176	667
Other investments	2,016	363
Derivative assets	8,126	8,688
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	77,991	77,258
Total assets	331,023	321,898
Liabilities [Abstract]
Derivative liabilities	6,344	6,101
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	6,349	6,105
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	3,424	3,674
Liabilities [Abstract]
Derivative liabilities	2,994	2,805
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,159	4,393
Liabilities [Abstract]
Derivative liabilities	2,918	2,737
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	271	228
Liabilities [Abstract]
Derivative liabilities	76	84
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	272	393
Liabilities [Abstract]
Derivative liabilities	356	475
Recurring | Level 2 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	5	4
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	70,349	67,003
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	41,047	40,813
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	44,091	45,438
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	18,026	16,925
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	33,367	27,495
Recurring | Level 2 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,138	15,191
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,798	11,171
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	8,557	9,099
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	35,756	32,947
Equity securities	242	249
Unit-linked and FVO securities	1,176	1,103
Short-term investments	6	27
Other investments	1,095	975
Derivative assets	29	38
Market risk benefits, at estimated fair value	310	286
Reinsured MRB Assets	16	18
Separate account assets	1,019	1,147
Total assets	39,649	36,790
Liabilities [Abstract]
Derivative liabilities	5	181
Embedded derivatives within liability host contracts	119	93
Market risk benefits, at estimated fair value	3,117	3,179
Total liabilities	3,241	3,453
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	174
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	25	23
Liabilities [Abstract]
Derivative liabilities	5	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	4	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	14,502	13,714
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,705	14,631
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	41	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	1,897	1,598
Recurring | Level 3 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2,382	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	$ 1,229	$ 850