Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 340,695	$ 354,809
Equity securities	1,001	1,079
Unit-linked and FVO Securities (2)	12,177	13,319
Short-term investments (3)	3,759	3,904
Residential mortgage loans — FVO	81,497	83,919
Derivative assets	10,361	11,866
Separate account assets	189,947	199,970
Liabilities [Abstract]
Derivative liabilities	4,028	4,229
Embedded derivatives within liability host contracts	622	1,196
Separate account liabilities	189,947	199,970
Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	140	165
Recurring
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	340,695	354,809
Equity securities	1,001	1,079
Unit-linked and FVO Securities (2)	12,177	13,319
Short-term investments (3)	3,196	3,373
Other investments	1,101	885
Derivative assets	10,361	11,866
Embedded derivatives within asset host contracts	48	55
Separate account assets	189,947	199,970
Total assets (7)	558,666	585,521
Liabilities [Abstract]
Derivative liabilities	4,028	4,229
Embedded derivatives within liability host contracts	622	1,196
Total liabilities	4,670	5,451
Recurring | Interest rate contracts
Assets [Abstract]
Derivative assets	7,048	8,329
Liabilities [Abstract]
Derivative liabilities	338	238
Recurring | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2,228	2,466
Liabilities [Abstract]
Derivative liabilities	3,012	3,101
Recurring | Credit contracts
Assets [Abstract]
Derivative assets	204	205
Liabilities [Abstract]
Derivative liabilities	121	121
Recurring | Equity market contracts
Assets [Abstract]
Derivative assets	881	866
Liabilities [Abstract]
Derivative liabilities	557	769
Recurring | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	20	26
Recurring | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	140	165
Recurring | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	91,371	93,416
Recurring | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	64,630	71,699
Recurring | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	65,605	69,408
Recurring | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	46,556	47,100
Recurring | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	29,848	30,435
Recurring | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	16,713	17,119
Recurring | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	13,923	13,722
Recurring | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	12,049	11,910
Recurring | Level 1
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	25,820	23,180
Equity securities	662	636
Unit-linked and FVO Securities (2)	9,573	10,559
Short-term investments (3)	2,683	2,762
Other investments	0	83
Derivative assets	9	17
Embedded derivatives within asset host contracts	0	0
Separate account assets	84,137	91,850
Total assets (7)	122,884	129,087
Liabilities [Abstract]
Derivative liabilities	17	40
Embedded derivatives within liability host contracts	0	0
Total liabilities	22	52
Recurring | Level 1 | Interest rate contracts
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	4	2
Recurring | Level 1 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	0	3
Liabilities [Abstract]
Derivative liabilities	4	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	9	14
Liabilities [Abstract]
Derivative liabilities	9	38
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	5	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	23,180
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	25,709	0
Recurring | Level 1 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	111	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	284,954	302,122
Equity securities	196	293
Unit-linked and FVO Securities (2)	1,755	2,059
Short-term investments (3)	400	568
Other investments	320	229
Derivative assets	10,165	11,137
Embedded derivatives within asset host contracts	0	0
Separate account assets	104,556	107,035
Total assets (7)	402,346	423,443
Liabilities [Abstract]
Derivative liabilities	3,881	4,071
Embedded derivatives within liability host contracts	0	0
Total liabilities	3,891	4,079
Recurring | Level 2 | Interest rate contracts
Assets [Abstract]
Derivative assets	6,974	7,840
Liabilities [Abstract]
Derivative liabilities	283	168
Recurring | Level 2 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	2,138	2,287
Liabilities [Abstract]
Derivative liabilities	2,935	3,063
Recurring | Level 2 | Credit contracts
Assets [Abstract]
Derivative assets	181	180
Liabilities [Abstract]
Derivative liabilities	115	121
Recurring | Level 2 | Equity market contracts
Assets [Abstract]
Derivative assets	872	830
Liabilities [Abstract]
Derivative liabilities	548	719
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	10	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	81,143	83,214
Recurring | Level 2 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	64,485	55,509
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	52,060	23,920
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	20,847	71,582
Recurring | Level 2 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	26,150	27,133
Recurring | Level 2 | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	15,087	15,734
Recurring | Level 2 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	13,923	13,722
Recurring | Level 2 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	11,259	11,308
Recurring | Level 3
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	29,921	29,507
Equity securities	143	150
Unit-linked and FVO Securities (2)	849	701
Short-term investments (3)	113	43
Other investments	781	573
Derivative assets	187	712
Embedded derivatives within asset host contracts	48	55
Separate account assets	1,254	1,085
Total assets (7)	33,436	32,991
Liabilities [Abstract]
Derivative liabilities	130	118
Embedded derivatives within liability host contracts	622	1,196
Total liabilities	757	1,320
Recurring | Level 3 | Interest rate contracts
Assets [Abstract]
Derivative assets	74	489
Liabilities [Abstract]
Derivative liabilities	51	68
Recurring | Level 3 | Foreign currency exchange rate contracts
Assets [Abstract]
Derivative assets	90	176
Liabilities [Abstract]
Derivative liabilities	73	38
Recurring | Level 3 | Credit contracts
Assets [Abstract]
Derivative assets	23	25
Liabilities [Abstract]
Derivative liabilities	6	0
Recurring | Level 3 | Equity market contracts
Assets [Abstract]
Derivative assets	0	22
Liabilities [Abstract]
Derivative liabilities	0	12
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts
Liabilities [Abstract]
Separate account liabilities	5	6
Recurring | Level 3 | Residential mortgage loans - FVO
Assets [Abstract]
Residential mortgage loans — FVO	140	165
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	10,228	10,202
Recurring | Level 3 | Foreign government
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	145	13,899
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	13,545	0
Recurring | Level 3 | U.S. government and agency
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	117
Recurring | Level 3 | RMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	3,587	3,302
Recurring | Level 3 | ABS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	1,626	1,385
Recurring | Level 3 | Municipals
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	0	0
Recurring | Level 3 | CMBS
Assets [Abstract]
Estimated Fair Value of Fixed Maturity Securities AFS	790	602
Other limited partnership interests | Recurring
Assets [Abstract]
Investments, Fair Value Disclosure	$ 75	$ 75