Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 341,038	$ 354,809
Equity securities	12,055	13,319
Short-term investments (3)	7,150	3,904
Residential mortgage loans — FVO	80,964	83,919
Derivative assets	10,519	11,866
Separate account assets	180,954	199,970
Liabilities [Abstract]
Derivative liabilities	3,751	4,229
Embedded derivatives within liability host contracts	626	1,196
Separate account liabilities	180,954	199,970
Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	134	165
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	341,038	354,809
Equity securities	941	1,079
Unit-linked and FVO Securities (2)	12,055	13,319
Short-term investments (3)	6,545	3,373
Other investments	894	885
Derivative assets	10,519	11,866
Embedded derivatives within asset host contracts	39	55
Separate account assets	180,954	199,970
Total assets (7)	553,119	585,521
Liabilities [Abstract]
Derivative liabilities	3,751	4,229
Embedded derivatives within liability host contracts	626	1,196
Total liabilities	4,398	5,451
Recurring | Interest rate contracts
Assets [Abstract]
Derivative assets	6,807	8,329
Liabilities [Abstract]
Derivative liabilities	388	238
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2,532	2,466
Liabilities [Abstract]
Derivative liabilities	2,767	3,101
Recurring | Credit contracts
Assets [Abstract]
Derivative assets	194	205
Liabilities [Abstract]
Derivative liabilities	115	121
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	986	866
Liabilities [Abstract]
Derivative liabilities	481	769
Recurring | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	21	26
Recurring | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	134	165
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	92,012	93,416
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	63,380	71,699
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	63,922	69,408
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	48,100	47,100
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	30,267	30,435
Recurring | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	17,403	17,119
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,040	13,722
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,914	11,910
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	27,500	23,180
Equity securities	594	636
Unit-linked and FVO Securities (2)	9,171	10,559
Short-term investments (3)	5,287	2,762
Other investments	0	83
Derivative assets	52	17
Embedded derivatives within asset host contracts	0	0
Separate account assets	78,361	91,850
Total assets (7)	120,965	129,087
Liabilities [Abstract]
Derivative liabilities	15	40
Embedded derivatives within liability host contracts	0	0
Total liabilities	19	52
Recurring | Level 1 | Interest rate contracts
Assets [Abstract]
Derivative assets	3	0
Liabilities [Abstract]
Derivative liabilities	1	2
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	1	3
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | Credit contracts
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring | Level 1 | Equity market contracts
Assets [Abstract]
Derivative assets	48	14
Liabilities [Abstract]
Derivative liabilities	14	38
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	4	12
Recurring | Level 1 | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	0	0
Recurring | Level 1 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	27,492	23,180
Recurring | Level 1 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	8	0
Recurring | Level 1 | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 1 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 2
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	283,082	302,122
Equity securities	196	293
Unit-linked and FVO Securities (2)	2,051	2,059
Short-term investments (3)	1,201	568
Other investments	49	229
Derivative assets	10,376	11,137
Embedded derivatives within asset host contracts	0	0
Separate account assets	101,190	107,035
Total assets (7)	398,145	423,443
Liabilities [Abstract]
Derivative liabilities	3,435	4,071
Embedded derivatives within liability host contracts	0	0
Total liabilities	3,448	4,079
Recurring | Level 2 | Interest rate contracts
Assets [Abstract]
Derivative assets	6,744	7,840
Liabilities [Abstract]
Derivative liabilities	349	168
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2,527	2,287
Liabilities [Abstract]
Derivative liabilities	2,509	3,063
Recurring | Level 2 | Credit contracts
Assets [Abstract]
Derivative assets	174	180
Liabilities [Abstract]
Derivative liabilities	110	121
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	931	830
Liabilities [Abstract]
Derivative liabilities	467	719
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	13	8
Recurring | Level 2 | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	0	0
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	80,783	83,214
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	63,274	71,582
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	50,415	55,509
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	20,608	23,920
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	27,023	27,133
Recurring | Level 2 | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,878	15,734
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	14,006	13,722
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,095	11,308
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	30,456	29,507
Equity securities	151	150
Unit-linked and FVO Securities (2)	833	701
Short-term investments (3)	57	43
Other investments	845	573
Derivative assets	91	712
Embedded derivatives within asset host contracts	39	55
Separate account assets	1,403	1,085
Total assets (7)	34,009	32,991
Liabilities [Abstract]
Derivative liabilities	301	118
Embedded derivatives within liability host contracts	626	1,196
Total liabilities	931	1,320
Recurring | Level 3 | Interest rate contracts
Assets [Abstract]
Derivative assets	60	489
Liabilities [Abstract]
Derivative liabilities	38	68
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	4	176
Liabilities [Abstract]
Derivative liabilities	258	38
Recurring | Level 3 | Credit contracts
Assets [Abstract]
Derivative assets	20	25
Liabilities [Abstract]
Derivative liabilities	5	0
Recurring | Level 3 | Equity market contracts
Assets [Abstract]
Derivative assets	7	22
Liabilities [Abstract]
Derivative liabilities	0	12
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	4	6
Recurring | Level 3 | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	134	165
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,229	10,202
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	106	117
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	13,507	13,899
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 3 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	3,236	3,302
Recurring | Level 3 | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	1,525	1,385
Recurring | Level 3 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	34	0
Recurring | Level 3 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	819	602
Other limited partnership interests | Recurring
Assets [Abstract]
Investments, Fair Value Disclosure	$ 82	$ 75