Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 79,831	$ 79,129
Trading securities	520	0
Equity securities	22	32
Derivative assets	7,795	4,118
Market risk benefit assets	1,084	1,092
Separate account assets	79,403	79,006
Liabilities [Abstract]
Market risk benefit liabilities	8,067	8,346
Derivative liabilities	7,398	5,248
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	79,831	79,129
Trading securities	520	0
Equity securities	22	32
Short-term investments	571	1,157
Derivative assets	7,795	4,118
Embedded derivatives on index-linked annuities (2)	80	47
Market risk benefit assets	1,084	1,092
Separate account assets	79,403	79,006
Total assets	169,306	164,581
Liabilities [Abstract]
Market risk benefit liabilities	8,067	8,346
Derivative liabilities	7,398	5,248
Embedded derivatives on index-linked annuities (2)	11,646	11,540
Total liabilities	27,111	25,134
Recurring | Interest rate
Assets [Abstract]
Derivative assets	266	287
Liabilities [Abstract]
Derivative liabilities	2,033	2,735
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	318	547
Liabilities [Abstract]
Derivative liabilities	114	25
Recurring | Credit
Assets [Abstract]
Derivative assets	28	19
Recurring | Equity market
Assets [Abstract]
Derivative assets	7,183	3,265
Liabilities [Abstract]
Derivative liabilities	5,251	2,488
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,088	36,737
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,699	11,762
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,781	7,230
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,393	6,460
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,171	6,306
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,308	6,292
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,450	3,382
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	941	960
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,365	2,514
Trading securities	94	0
Equity securities	10	11
Short-term investments	486	916
Derivative assets	0	0
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	6	3
Total assets	2,961	3,444
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	1	1
Embedded derivatives on index-linked annuities (2)	0	0
Total liabilities	1	1
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	1	1
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 | RMBS
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	2,365	2,514
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	76,273	75,137
Trading securities	423	0
Equity securities	6	6
Short-term investments	85	239
Derivative assets	7,787	4,109
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	79,397	79,003
Total assets	163,971	158,494
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	7,397	5,247
Embedded derivatives on index-linked annuities (2)	0	0
Total liabilities	7,397	5,247
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	266	287
Liabilities [Abstract]
Derivative liabilities	2,033	2,735
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	312	540
Liabilities [Abstract]
Derivative liabilities	114	25
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	26	17
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	7,183	3,265
Liabilities [Abstract]
Derivative liabilities	5,250	2,487
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	36,438	36,041
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,586	11,366
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,767	7,213
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,028	3,946
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,779	5,984
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,308	6,266
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,450	3,382
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	917	939
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,193	1,478
Trading securities	3	0
Equity securities	6	15
Short-term investments	0	2
Derivative assets	8	9
Embedded derivatives on index-linked annuities (2)	80	47
Market risk benefit assets	1,084	1,092
Separate account assets	0	0
Total assets	2,374	2,643
Liabilities [Abstract]
Market risk benefit liabilities	8,067	8,346
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities (2)	11,646	11,540
Total liabilities	19,713	19,886
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	7
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets	2	2
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	650	696
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	113	396
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	14	17
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 3 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	392	322
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	26
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	$ 24	$ 21