Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 77,712	$ 86,527
Equity securities	82	95
Short-term investments	107	662
Derivative assets: (1)	3,207	3,298
Embedded derivatives within asset host contracts	132	186
Separate account assets	82,622	106,225
Liabilities [Abstract]
Derivative liabilities: (1)	8,233	10,444
Embedded derivatives within liability host contracts	4,799	8,800
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	77,712	86,527
Equity securities	82	95
Short-term investments	107	662
Derivative assets: (1)	3,075	3,112
Embedded derivatives within asset host contracts	132	186
Separate account assets	82,622	106,225
Total assets	163,730	196,807
Liabilities [Abstract]
Derivative liabilities: (1)	3,434	1,644
Embedded derivatives within liability host contracts	4,799	8,800
Total liabilities	8,233	10,444
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)	677	314
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	32,974	38,474
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	10,461	11,605
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,310	9,220
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,476	9,168
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,636	7,193
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,986	4,760
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,679	4,275
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	4,618	3,159
Equity securities	16	21
Short-term investments	77	640
Derivative assets: (1)	0	0
Embedded derivatives within asset host contracts	0	0
Separate account assets	30	41
Total assets	4,741	3,861
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 | 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	4,618	3,159
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	70,999	81,723
Equity securities	39	61
Short-term investments	30	20
Derivative assets: (1)	3,032	3,074
Embedded derivatives within asset host contracts	0	0
Separate account assets	82,592	106,184
Total assets	156,692	191,062
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)	649	304
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	31,844	37,568
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,881	11,112
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,243	9,209
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,858	6,009
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,602	7,149
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,986	4,760
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,435	4,110
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	4,799	8,800
Total liabilities	4,804	8,802
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	906
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	580	493
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	67	11
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	0	0
Recurring | Level 3 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	34	44
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