Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 79,602	$ 80,085
Equity securities	47	66
Short-term investments	654	574
Derivative assets	3,833	3,703
Market risk benefit assets	839	656
Separate account assets	83,489	81,690
Liabilities [Abstract]
Market risk benefit liabilities	8,985	10,344
Derivative liabilities	5,373	5,080
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	79,602	80,085
Equity securities	47	66
Short-term investments	654	574
Derivative assets	3,833	3,703
Embedded derivatives on index-linked annuities	22	0
Market risk benefit assets	839	656
Separate account assets	83,489	81,690
Total assets	168,486	166,774
Liabilities [Abstract]
Market risk benefit liabilities	8,985	10,344
Derivative liabilities	5,373	5,080
Embedded derivatives on index-linked annuities	9,963	8,186
Total liabilities	24,321	23,610
Recurring | Interest rate
Assets [Abstract]
Derivative assets	259	245
Liabilities [Abstract]
Derivative liabilities	2,738	2,209
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	472	438
Liabilities [Abstract]
Derivative liabilities	31	47
Recurring | Credit
Assets [Abstract]
Derivative assets	29	27
Liabilities [Abstract]
Derivative liabilities	1	0
Recurring | Equity market
Assets [Abstract]
Derivative assets	3,073	2,993
Liabilities [Abstract]
Derivative liabilities	2,603	2,824
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	35,529	35,339
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,678	11,582
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,445	8,214
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,400	7,366
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,460	6,401
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,388	6,339
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,699	3,813
Recurring | Foreign Government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,003	1,031
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,058	3,680
Equity securities	12	18
Short-term investments	215	214
Derivative assets	0	0
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	14	20
Total assets	3,299	3,932
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities	0	0
Total liabilities	0	0
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	0	0
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
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,058	3,680
Recurring | Level 1 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 1 | Foreign Government
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 2
Assets [Abstract]
Fixed maturity securities, estimated fair value	74,774	74,669
Equity securities	10	23
Short-term investments	439	360
Derivative assets	3,822	3,685
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	83,475	81,670
Total assets	162,520	160,407
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	5,373	5,080
Embedded derivatives on index-linked annuities	0	0
Total liabilities	5,373	5,080
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	259	245
Liabilities [Abstract]
Derivative liabilities	2,738	2,209
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	466	426
Liabilities [Abstract]
Derivative liabilities	31	47
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	24	21
Liabilities [Abstract]
Derivative liabilities	1	0
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	3,073	2,993
Liabilities [Abstract]
Derivative liabilities	2,603	2,824
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	34,587	34,344
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,353	11,257
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,387	4,534
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,380	7,351
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,041	6,075
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,345	6,300
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,699	3,813
Recurring | Level 2 | Foreign Government
Assets [Abstract]
Fixed maturity securities, estimated fair value	982	995
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,770	1,736
Equity securities	25	25
Short-term investments	0	0
Derivative assets	11	18
Embedded derivatives on index-linked annuities	22	0
Market risk benefit assets	839	656
Separate account assets	0	0
Total assets	2,667	2,435
Liabilities [Abstract]
Market risk benefit liabilities	8,985	10,344
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities	9,963	8,186
Total liabilities	18,948	18,530
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	6	12
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	5	6
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Equity market
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	942	995
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	325	325
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	20	15
Recurring | Level 3 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	419	326
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	43	39
Recurring | Level 3 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 3 | Foreign Government
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 21	$ 36