Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 79,729	$ 79,129
Trading securities	365	0
Equity securities	31	32
Derivative assets	4,146	4,118
Market risk benefit assets	914	1,092
Separate account assets	76,257	79,006
Liabilities [Abstract]
Market risk benefit liabilities	9,182	8,346
Derivative liabilities	5,286	5,248
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	79,729	79,129
Trading securities	365	0
Equity securities	31	32
Short-term investments	891	1,157
Derivative assets	4,146	4,118
Embedded derivatives on index-linked annuities (2)	38	47
Market risk benefit assets	914	1,092
Separate account assets	76,257	79,006
Total assets	162,371	164,581
Liabilities [Abstract]
Market risk benefit liabilities	9,182	8,346
Derivative liabilities	5,286	5,248
Embedded derivatives on index-linked annuities (2)	9,963	11,540
Total liabilities	24,431	25,134
Recurring | Interest rate
Assets [Abstract]
Derivative assets	260	287
Liabilities [Abstract]
Derivative liabilities	2,069	2,735
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	524	547
Liabilities [Abstract]
Derivative liabilities	28	25
Recurring | Credit
Assets [Abstract]
Derivative assets	16	19
Recurring | Equity market
Assets [Abstract]
Derivative assets	3,346	3,265
Liabilities [Abstract]
Derivative liabilities	3,189	2,488
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,112	36,737
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,562	11,762
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,533	7,230
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,614	6,460
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,122	6,306
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,352	6,292
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,469	3,382
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	965	960
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,557	2,514
Trading securities	66	0
Equity securities	11	11
Short-term investments	705	916
Derivative assets	1	0
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	3	3
Total assets	3,343	3,444
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	0	1
Embedded derivatives on index-linked annuities (2)	0	0
Total liabilities	0	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	1	0
Liabilities [Abstract]
Derivative liabilities	0	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	2,557	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	76,144	75,137
Trading securities	299	0
Equity securities	6	6
Short-term investments	184	239
Derivative assets	4,136	4,109
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	76,254	79,003
Total assets	157,023	158,494
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	5,286	5,247
Embedded derivatives on index-linked annuities (2)	0	0
Total liabilities	5,286	5,247
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	260	287
Liabilities [Abstract]
Derivative liabilities	2,069	2,735
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	517	540
Liabilities [Abstract]
Derivative liabilities	28	25
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	14	17
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	3,345	3,265
Liabilities [Abstract]
Derivative liabilities	3,189	2,487
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	36,544	36,041
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,464	11,366
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,500	7,213
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,057	3,946
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,820	5,984
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,347	6,266
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,469	3,382
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	943	939
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,028	1,478
Trading securities	0	0
Equity securities	14	15
Short-term investments	2	2
Derivative assets	9	9
Embedded derivatives on index-linked annuities (2)	38	47
Market risk benefit assets	914	1,092
Separate account assets	0	0
Total assets	2,005	2,643
Liabilities [Abstract]
Market risk benefit liabilities	9,182	8,346
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities (2)	9,963	11,540
Total liabilities	19,145	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	7	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	568	696
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	98	396
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	33	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	302	322
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5	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	$ 22	$ 21