Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 81,502	$ 86,527
Equity securities	75	95
Short-term investments	111	662
Derivative assets: (1)	2,490	3,298
Embedded derivatives within asset host contracts	151	186
Separate account assets	96,995	106,225
Liabilities [Abstract]
Derivative liabilities: (1)	9,172	10,444
Embedded derivatives within liability host contracts	7,311	8,800
Recurring
Assets [Abstract]
Fixed maturity securities, estimated fair value	81,502	86,527
Equity securities	75	95
Short-term investments	111	662
Derivative assets: (1)	2,339	3,112
Embedded derivatives within asset host contracts	151	186
Separate account assets	96,995	106,225
Total assets	181,173	196,807
Liabilities [Abstract]
Derivative liabilities: (1)	1,861	1,644
Embedded derivatives within liability host contracts	7,311	8,800
Total liabilities	9,172	10,444
Recurring | Interest rate
Assets [Abstract]
Derivative assets: (1)	434	1,094
Liabilities [Abstract]
Derivative liabilities: (1)	581	130
Recurring | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	350	314
Liabilities [Abstract]
Derivative liabilities: (1)	45	47
Recurring | Credit
Assets [Abstract]
Derivative assets: (1)	29	39
Liabilities [Abstract]
Derivative liabilities: (1)	2	1
Recurring | Equity market
Assets [Abstract]
Derivative assets: (1)	1,526	1,665
Liabilities [Abstract]
Derivative liabilities: (1)	1,233	1,466
Recurring | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	35,451	38,474
Recurring | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	10,947	11,605
Recurring | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,692	9,220
Recurring | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	9,463	9,168
Recurring | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,894	7,193
Recurring | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,240	4,760
Recurring | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,504	4,275
Recurring | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,311	1,832
Recurring | Level 1
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,093	3,159
Equity securities	20	21
Short-term investments	90	640
Derivative assets: (1)	0	0
Embedded derivatives within asset host contracts	0	0
Separate account assets	44	41
Total assets	4,247	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	4,093	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	75,574	81,723
Equity securities	42	61
Short-term investments	21	20
Derivative assets: (1)	2,306	3,074
Embedded derivatives within asset host contracts	0	0
Separate account assets	96,951	106,184
Total assets	174,894	191,062
Liabilities [Abstract]
Derivative liabilities: (1)	1,858	1,642
Embedded derivatives within liability host contracts	0	0
Total liabilities	1,858	1,642
Recurring | Level 2 | Interest rate
Assets [Abstract]
Derivative assets: (1)	434	1,094
Liabilities [Abstract]
Derivative liabilities: (1)	581	130
Recurring | Level 2 | Foreign currency exchange rate
Assets [Abstract]
Derivative assets: (1)	335	304
Liabilities [Abstract]
Derivative liabilities: (1)	45	47
Recurring | Level 2 | Credit
Assets [Abstract]
Derivative assets: (1)	20	27
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 2 | Equity market
Assets [Abstract]
Derivative assets: (1)	1,517	1,649
Liabilities [Abstract]
Derivative liabilities: (1)	1,232	1,465
Recurring | Level 2 | U.S. corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	34,416	37,568
Recurring | Level 2 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	10,364	11,112
Recurring | Level 2 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	8,675	9,209
Recurring | Level 2 | U.S. government and agency
Assets [Abstract]
Fixed maturity securities, estimated fair value	5,370	6,009
Recurring | Level 2 | CMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	6,888	7,149
Recurring | Level 2 | State and political subdivision
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,240	4,760
Recurring | Level 2 | ABS
Assets [Abstract]
Fixed maturity securities, estimated fair value	4,333	4,110
Recurring | Level 2 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,288	1,806
Recurring | Level 3
Assets [Abstract]
Fixed maturity securities, estimated fair value	1,835	1,645
Equity securities	13	13
Short-term investments	0	2
Derivative assets: (1)	33	38
Embedded derivatives within asset host contracts	151	186
Separate account assets	0	0
Total assets	2,032	1,884
Liabilities [Abstract]
Derivative liabilities: (1)	3	2
Embedded derivatives within liability host contracts	7,311	8,800
Total liabilities	7,314	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)	15	10
Liabilities [Abstract]
Derivative liabilities: (1)	0	0
Recurring | Level 3 | Credit
Assets [Abstract]
Derivative assets: (1)	9	12
Liabilities [Abstract]
Derivative liabilities: (1)	2	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	1,035	906
Recurring | Level 3 | Foreign corporate
Assets [Abstract]
Fixed maturity securities, estimated fair value	583	493
Recurring | Level 3 | RMBS
Assets [Abstract]
Fixed maturity securities, estimated fair value	17	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	6	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	171	165
Recurring | Level 3 | Foreign government
Assets [Abstract]
Fixed maturity securities, estimated fair value	$ 23	$ 26