Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 291,735	$ 281,043
Equity securities	747	712
Unit-linked and FVO securities	10,725	10,672
Short-term investments	5,543	5,156
Derivative assets	8,602	8,212
Market risk benefits, at estimated fair value	317	372
Separate account assets	138,143	139,504
Liabilities [Abstract]
Derivative liabilities	6,802	7,259
Embedded derivatives within liability host contracts	43	9
Market risk benefits, at estimated fair value	2,844	2,581
Separate account liabilities	138,143	139,504
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	291,735	281,043
Equity securities	747	712
Unit-linked and FVO securities	10,725	10,672
Short-term investments	5,189	4,834
Other investments	1,226	1,110
Derivative assets	8,602	8,212
Market risk benefits, at estimated fair value	317	372
Reinsured MRB Assets	15	12
Separate account assets	138,143	139,504
Total assets	456,699	446,471
Liabilities [Abstract]
Derivative liabilities	6,802	7,259
Embedded derivatives within liability host contracts	43	9
Market risk benefits, at estimated fair value	2,844	2,581
Total liabilities	9,693	9,851
Recurring | Interest rate
Assets [Abstract]
Derivative assets	3,206	3,005
Liabilities [Abstract]
Derivative liabilities	3,416	3,464
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,734	4,709
Liabilities [Abstract]
Derivative liabilities	3,058	3,452
Recurring | Credit
Assets [Abstract]
Derivative assets	212	215
Liabilities [Abstract]
Derivative liabilities	71	72
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	450	283
Liabilities [Abstract]
Derivative liabilities	257	271
Recurring | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	4	2
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	81,195	79,374
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	55,527	53,759
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	41,253	40,250
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	39,408	34,421
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	33,875	33,428
Recurring | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	20,998	20,591
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,904	9,873
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,575	9,347
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,375	16,675
Equity securities	424	415
Unit-linked and FVO securities	7,365	7,306
Short-term investments	4,032	4,127
Other investments	41	37
Derivative assets	42	11
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	65,342	63,979
Total assets	93,621	92,550
Liabilities [Abstract]
Derivative liabilities	14	7
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	14	7
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	3	1
Liabilities [Abstract]
Derivative liabilities	12	1
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2	1
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	37	9
Liabilities [Abstract]
Derivative liabilities	2	6
Recurring | Level 1 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	0	0
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 | RMBS
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	16,375	16,675
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	242,982	229,176
Equity securities	75	61
Unit-linked and FVO securities	2,185	2,176
Short-term investments	1,148	702
Other investments	64	63
Derivative assets	8,534	8,184
Market risk benefits, at estimated fair value	0	0
Reinsured MRB Assets	0	0
Separate account assets	71,829	74,535
Total assets	326,817	314,897
Liabilities [Abstract]
Derivative liabilities	6,783	7,240
Embedded derivatives within liability host contracts	0	0
Market risk benefits, at estimated fair value	0	0
Total liabilities	6,787	7,242
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	3,203	3,004
Liabilities [Abstract]
Derivative liabilities	3,404	3,463
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4,706	4,694
Liabilities [Abstract]
Derivative liabilities	3,053	3,440
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	212	215
Liabilities [Abstract]
Derivative liabilities	71	72
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	413	271
Liabilities [Abstract]
Derivative liabilities	255	265
Recurring | Level 2 | Separate account liabilities
Liabilities [Abstract]
Separate account liabilities	4	2
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	68,622	67,333
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	40,588	39,295
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	41,196	40,209
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	36,469	32,771
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,500	16,753
Recurring | Level 2 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	19,689	14,755
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,902	9,866
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	9,016	8,194
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	32,378	35,192
Equity securities	248	236
Unit-linked and FVO securities	1,175	1,190
Short-term investments	9	5
Other investments	1,121	1,010
Derivative assets	26	17
Market risk benefits, at estimated fair value	317	372
Reinsured MRB Assets	15	12
Separate account assets	972	990
Total assets	36,261	39,024
Liabilities [Abstract]
Derivative liabilities	5	12
Embedded derivatives within liability host contracts	43	9
Market risk benefits, at estimated fair value	2,844	2,581
Total liabilities	2,892	2,602
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	26	14
Liabilities [Abstract]
Derivative liabilities	5	12
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Equity market contracts
Assets [Abstract]
Derivative assets	0	3
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	12,573	12,041
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,939	14,464
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	57	41
Recurring | Level 3 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2,939	1,650
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 3 | ABS & CLO
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	1,309	5,836
Recurring | Level 3 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	2	7
Recurring | Level 3 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	559	1,153
Other limited partnership interests | Recurring
Assets [Abstract]
Investments, fair value	$ 49	$ 50