Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 82,400	$ 80,085
Equity securities	43	66
Short-term investments	1,086	574
Derivative assets	3,439	3,703
Market risk benefit assets	750	656
Separate account assets	83,439	81,690
Liabilities [Abstract]
Market risk benefit liabilities	9,599	10,344
Derivative liabilities	4,002	5,080
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	82,400	80,085
Equity securities	43	66
Short-term investments	1,086	574
Derivative assets	3,439	3,703
Embedded derivatives on index-linked annuities	44	0
Market risk benefit assets	750	656
Separate account assets	83,439	81,690
Total assets	171,201	166,774
Liabilities [Abstract]
Market risk benefit liabilities	9,599	10,344
Derivative liabilities	4,002	5,080
Embedded derivatives on index-linked annuities	11,571	8,186
Total liabilities	25,172	23,610
Recurring | Interest rate
Assets [Abstract]
Derivative assets	272	245
Liabilities [Abstract]
Derivative liabilities	1,586	2,209
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	401	438
Liabilities [Abstract]
Derivative liabilities	50	47
Recurring | Credit
Assets [Abstract]
Derivative assets	20	27
Recurring | Equity market
Assets [Abstract]
Derivative assets	2,746	2,993
Liabilities [Abstract]
Derivative liabilities	2,366	2,824
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,654	35,339
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	12,327	11,582
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,344	8,214
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,882	7,366
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,266	6,401
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,427	6,339
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,479	3,813
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,021	1,031
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,664	3,680
Equity securities	11	18
Short-term investments	779	214
Derivative assets	0	0
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	17	20
Total assets	3,471	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	2,664	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	78,225	74,669
Equity securities	10	23
Short-term investments	305	360
Derivative assets	3,429	3,685
Embedded derivatives on index-linked annuities	0	0
Market risk benefit assets	0	0
Separate account assets	83,422	81,670
Total assets	165,391	160,407
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	4,002	5,080
Embedded derivatives on index-linked annuities	0	0
Total liabilities	4,002	5,080
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	272	245
Liabilities [Abstract]
Derivative liabilities	1,586	2,209
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	394	426
Liabilities [Abstract]
Derivative liabilities	50	47
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	17	21
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	2,746	2,993
Liabilities [Abstract]
Derivative liabilities	2,366	2,824
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	36,957	34,344
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,932	11,257
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,680	4,534
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,845	7,351
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,933	6,075
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,401	6,300
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,479	3,813
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	998	995
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,511	1,736
Equity securities	22	25
Short-term investments	2	0
Derivative assets	10	18
Embedded derivatives on index-linked annuities	44	0
Market risk benefit assets	750	656
Separate account assets	0	0
Total assets	2,339	2,435
Liabilities [Abstract]
Market risk benefit liabilities	9,599	10,344
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities	11,571	8,186
Total liabilities	21,170	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	7	12
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	3	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	697	995
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	395	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	37	15
Recurring | Level 3 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	333	326
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	26	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	$ 23	$ 36