Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 79,798	$ 80,085
Equity securities	45	66
Short-term investments	619	574
Derivative assets	3,293	3,703
Market risk benefit assets	916	656
Separate account assets	81,575	81,690
Liabilities [Abstract]
Market risk benefit liabilities	8,727	10,344
Derivative liabilities	4,129	5,080
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	79,798	80,085
Equity securities	45	66
Short-term investments	619	574
Derivative assets	3,293	3,703
Embedded derivatives on index-linked annuities	38	0
Market risk benefit assets	916	656
Separate account assets	81,575	81,690
Total assets	166,284	166,774
Liabilities [Abstract]
Market risk benefit liabilities	8,727	10,344
Derivative liabilities	4,129	5,080
Embedded derivatives on index-linked annuities	10,621	8,186
Total liabilities	23,477	23,610
Recurring | Interest rate
Assets [Abstract]
Derivative assets	219	245
Liabilities [Abstract]
Derivative liabilities	2,056	2,209
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	504	438
Liabilities [Abstract]
Derivative liabilities	23	47
Recurring | Credit
Assets [Abstract]
Derivative assets	20	27
Recurring | Equity market
Assets [Abstract]
Derivative assets	2,550	2,993
Liabilities [Abstract]
Derivative liabilities	2,050	2,824
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	35,772	35,339
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,931	11,582
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,107	8,214
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,734	7,366
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,457	6,401
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,317	6,339
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,499	3,813
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	981	1,031
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,748	3,680
Equity securities	12	18
Short-term investments	204	214
Derivative assets	0	0
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	21	20
Total assets	2,985	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
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	2,748	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	75,158	74,669
Equity securities	9	23
Short-term investments	415	360
Derivative assets	3,283	3,685
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	81,554	81,670
Total assets	160,419	160,407
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	4,129	5,080
Embedded derivatives on index-linked annuities	0	0
Total liabilities	4,129	5,080
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	219	245
Liabilities [Abstract]
Derivative liabilities	2,056	2,209
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	498	426
Liabilities [Abstract]
Derivative liabilities	23	47
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	16	21
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	2,550	2,993
Liabilities [Abstract]
Derivative liabilities	2,050	2,824
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	34,868	34,344
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,470	11,257
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,359	4,534
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,711	7,351
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,042	6,075
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,249	6,300
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,499	3,813
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	960	995
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,892	1,736
Equity securities	24	25
Short-term investments	0	0
Derivative assets	10	18
Embedded derivatives on index-linked annuities	38	0
Market risk benefit assets	916	656
Separate account assets	0	0
Total assets	2,880	2,435
Liabilities [Abstract]
Market risk benefit liabilities	8,727	10,344
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities	10,621	8,186
Total liabilities	19,348	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	4	6
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	904	995
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	461	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	23	15
Recurring | Level 3 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	415	326
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	68	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