Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 80,541	$ 79,129
Trading securities	528	0
Equity securities	22	32
Derivative assets	7,693	4,118
Market risk benefit assets	979	1,092
Separate account assets	80,311	79,006
Liabilities [Abstract]
Market risk benefit liabilities	8,546	8,346
Derivative liabilities	6,550	5,248
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	80,541	79,129
Trading securities	528	0
Equity securities	22	32
Short-term investments	333	1,157
Derivative assets	7,693	4,118
Embedded derivatives on index-linked annuities (2)	79	47
Market risk benefit assets	979	1,092
Separate account assets	80,311	79,006
Total assets	170,486	164,581
Liabilities [Abstract]
Market risk benefit liabilities	8,546	8,346
Derivative liabilities	6,550	5,248
Embedded derivatives on index-linked annuities (2)	12,770	11,540
Total liabilities	27,866	25,134
Recurring | Interest rate
Assets [Abstract]
Derivative assets	288	287
Liabilities [Abstract]
Derivative liabilities	1,971	2,735
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	376	547
Liabilities [Abstract]
Derivative liabilities	92	25
Recurring | Credit
Assets [Abstract]
Derivative assets	11	19
Recurring | Equity market
Assets [Abstract]
Derivative assets	7,018	3,265
Liabilities [Abstract]
Derivative liabilities	4,487	2,488
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,829	36,737
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,633	11,762
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,218	7,230
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,412	6,460
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,986	6,306
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,030	6,292
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,458	3,382
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	975	960
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,268	2,514
Trading securities	88	0
Equity securities	9	11
Short-term investments	251	916
Derivative assets	12	0
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	19	3
Total assets	2,647	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	12	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	2,268	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	77,235	75,137
Trading securities	440	0
Equity securities	7	6
Short-term investments	77	239
Derivative assets	7,673	4,109
Embedded derivatives on index-linked annuities (2)	0	0
Market risk benefit assets	0	0
Separate account assets	80,292	79,003
Total assets	165,724	158,494
Liabilities [Abstract]
Market risk benefit liabilities	0	0
Derivative liabilities	6,550	5,247
Embedded derivatives on index-linked annuities (2)	0	0
Total liabilities	6,550	5,247
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets	288	287
Liabilities [Abstract]
Derivative liabilities	1,971	2,735
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets	370	540
Liabilities [Abstract]
Derivative liabilities	92	25
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets	9	17
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets	7,006	3,265
Liabilities [Abstract]
Derivative liabilities	4,487	2,487
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,251	36,041
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,514	11,366
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,199	7,213
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,144	3,946
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,708	5,984
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,010	6,266
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,458	3,382
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	951	939
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,038	1,478
Trading securities	0	0
Equity securities	6	15
Short-term investments	5	2
Derivative assets	8	9
Embedded derivatives on index-linked annuities (2)	79	47
Market risk benefit assets	979	1,092
Separate account assets	0	0
Total assets	2,115	2,643
Liabilities [Abstract]
Market risk benefit liabilities	8,546	8,346
Derivative liabilities	0	0
Embedded derivatives on index-linked annuities (2)	12,770	11,540
Total liabilities	21,316	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	578	696
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	119	396
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	19	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	278	322
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	20	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