Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 78,606	$ 87,582
Equity securities	96	101
Short-term investments	920	1,841
Derivative assets: (1)	3,227	3,312
Embedded derivatives within asset host contracts	132	186
Separate account assets	88,843	114,464
Liabilities [Abstract]
Derivative liabilities: (1)	8,011	10,140
Embedded derivatives within liability host contracts	4,577	8,496
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	78,606	87,582
Equity securities	96	101
Short-term investments	920	1,841
Derivative assets: (1)	3,095	3,126
Embedded derivatives within asset host contracts	132	186
Separate account assets	88,843	114,464
Total assets	171,692	207,300
Liabilities [Abstract]
Derivative liabilities: (1)	3,434	1,644
Embedded derivatives within liability host contracts	4,577	8,496
Total liabilities	8,011	10,140
Recurring | Interest rate
Assets [Abstract]
Derivative assets: (1)	416	1,094
Liabilities [Abstract]
Derivative liabilities: (1)	1,757	130
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	697	328
Liabilities [Abstract]
Derivative liabilities: (1)	6	47
Recurring | Credit
Assets [Abstract]
Derivative assets: (1)	7	39
Liabilities [Abstract]
Derivative liabilities: (1)	7	1
Recurring | Equity market
Assets [Abstract]
Derivative assets: (1)	1,975	1,665
Liabilities [Abstract]
Derivative liabilities: (1)	1,664	1,466
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	33,472	39,081
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	10,547	11,706
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,607	9,307
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,343	9,259
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,714	7,282
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,049	4,835
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,684	4,280
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,190	1,832
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,687	3,236
Equity securities	30	27
Short-term investments	488	1,503
Derivative assets: (1)	0	0
Embedded derivatives within asset host contracts	0	0
Separate account assets	30	41
Total assets	5,235	4,807
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Embedded derivatives within liability host contracts	0	0
Total liabilities	0	0
Recurring | Level 1 | Interest rate
Assets [Abstract]
Derivative assets: (1)	0	0
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 1 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	0	0
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 1 | Credit
Assets [Abstract]
Derivative assets: (1)	0	0
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 1 | Equity market
Assets [Abstract]
Derivative assets: (1)	0	0
Liabilities [Abstract]
Derivative liabilities: (1)	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	4,687	3,236
Recurring | Level 1 | RMBS
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 | ABS
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	71,824	82,701
Equity securities	39	61
Short-term investments	432	336
Derivative assets: (1)	3,052	3,088
Embedded derivatives within asset host contracts	0	0
Separate account assets	88,813	114,423
Total assets	164,160	200,609
Liabilities [Abstract]
Derivative liabilities: (1)	3,429	1,642
Embedded derivatives within liability host contracts	0	0
Total liabilities	3,429	1,642
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets: (1)	416	1,094
Liabilities [Abstract]
Derivative liabilities: (1)	1,757	130
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	669	318
Liabilities [Abstract]
Derivative liabilities: (1)	6	47
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets: (1)	1	27
Liabilities [Abstract]
Derivative liabilities: (1)	3	0
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets: (1)	1,966	1,649
Liabilities [Abstract]
Derivative liabilities: (1)	1,663	1,465
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	32,342	38,176
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,967	11,212
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,920	6,071
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,276	9,247
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,680	7,239
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,049	4,835
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,440	4,115
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,150	1,806
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	2,095	1,645
Equity securities	27	13
Short-term investments	0	2
Derivative assets: (1)	43	38
Embedded derivatives within asset host contracts	132	186
Separate account assets	0	0
Total assets	2,297	1,884
Liabilities [Abstract]
Derivative liabilities: (1)	5	2
Embedded derivatives within liability host contracts	4,577	8,496
Total liabilities	4,582	8,498
Recurring | Level 3 | Interest rate
Assets [Abstract]
Derivative assets: (1)	0	0
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 3 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	28	10
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets: (1)	6	12
Liabilities [Abstract]
Derivative liabilities: (1)	4	1
Recurring | Level 3 | Equity market
Assets [Abstract]
Derivative assets: (1)	9	16
Liabilities [Abstract]
Derivative liabilities: (1)	1	1
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,130	905
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	580	494
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	67	12
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	34	43
Recurring | Level 3 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 3 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	244	165
Recurring | Level 3 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 40	$ 26