Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 86,527	$ 81,299
Equity Securities, FV-NI	95	133
Short-term investments	662	1,885
Derivative assets: (1)	3,298	3,852
Embedded derivatives within asset host contracts (2)	186	283
Separate account assets	106,225	103,986
Liabilities [Abstract]
Derivative liabilities: (1)	10,444	9,608
Embedded derivatives within liability host contracts (2)	8,800	7,584
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	86,527	81,299
Equity Securities, FV-NI	95	133
Short-term investments	662	1,885
Derivative assets: (1)	3,112	3,569
Embedded derivatives within asset host contracts (2)	186	283
Separate account assets	106,225	103,986
Total assets	196,807	191,155
Liabilities [Abstract]
Derivative liabilities: (1)	1,644	2,024
Embedded derivatives within liability host contracts (2)	8,800	7,584
Total liabilities	10,444	9,608
Recurring | Interest rate
Assets [Abstract]
Derivative assets: (1)	1,094	2,094
Liabilities [Abstract]
Derivative liabilities: (1)	130	200
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	314	207
Liabilities [Abstract]
Derivative liabilities: (1)	47	144
Recurring | Credit
Assets [Abstract]
Derivative assets: (1)	39	41
Liabilities [Abstract]
Derivative liabilities: (1)	1
Recurring | Equity market
Assets [Abstract]
Derivative assets: (1)	1,665	1,227
Liabilities [Abstract]
Derivative liabilities: (1)	1,466	1,680
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	38,474	37,276
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,605	11,375
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,220	8,219
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,168	8,464
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,193	6,697
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,760	4,555
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,275	2,881
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,832	1,832
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	3,159	2,108
Equity Securities, FV-NI	21	31
Short-term investments	640	1,669
Derivative assets: (1)	0	0
Embedded derivatives within asset host contracts (2)	0	0
Separate account assets	41	86
Total assets	3,861	3,894
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Embedded derivatives within liability host contracts (2)	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
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	3,159	2,108
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	81,723	78,440
Equity Securities, FV-NI	61	99
Short-term investments	20	216
Derivative assets: (1)	3,074	3,540
Embedded derivatives within asset host contracts (2)	0	0
Separate account assets	106,184	103,897
Total assets	191,062	186,192
Liabilities [Abstract]
Derivative liabilities: (1)	1,642	1,997
Embedded derivatives within liability host contracts (2)	0	0
Total liabilities	1,642	1,997
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets: (1)	1,094	2,094
Liabilities [Abstract]
Derivative liabilities: (1)	130	200
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	304	206
Liabilities [Abstract]
Derivative liabilities: (1)	47	137
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets: (1)	27	27
Liabilities [Abstract]
Derivative liabilities: (1)	0
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets: (1)	1,649	1,213
Liabilities [Abstract]
Derivative liabilities: (1)	1,465	1,660
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	37,568	36,789
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	11,112	11,178
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,209	8,197
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,009	6,356
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	7,149	6,692
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,760	4,555
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,110	2,841
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,806	1,832
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,645	751
Equity Securities, FV-NI	13	3
Short-term investments	2	0
Derivative assets: (1)	38	29
Embedded derivatives within asset host contracts (2)	186	283
Separate account assets	0	3
Total assets	1,884	1,069
Liabilities [Abstract]
Derivative liabilities: (1)	2	27
Embedded derivatives within liability host contracts (2)	8,800	7,584
Total liabilities	8,802	7,611
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)	10	1
Liabilities [Abstract]
Derivative liabilities: (1)	0	7
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets: (1)	12	14
Liabilities [Abstract]
Derivative liabilities: (1)	1
Recurring | Level 3 | Equity market
Assets [Abstract]
Derivative assets: (1)	16	14
Liabilities [Abstract]
Derivative liabilities: (1)	1	20
Recurring | Level 3 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	906	487
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	493	197
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	11	22
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	44	5
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	165	40
Recurring | Level 3 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 26	$ 0