Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Total number of securities in an unrealized loss position less than 12 months	4,774	2,177
Equal to or Greater than 12 Months ,Gross Unrealized Loss	$ 1,200
Total number of securities in an unrealized loss position equal or greater than 12 months	979	690
Fixed Maturity Securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	$ 62,019	$ 27,727
Less than 12 months, Gross Unrealized Loss	1,264	1,031
Equal to or Greater than 12 Months, Estimated Fair Value	13,224	6,236
Equal to or Greater than 12 Months ,Gross Unrealized Loss	1,154	401
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	8,076	4,338
Less than 12 months, Gross Unrealized Loss	165	196
Equal to or Greater than 12 Months, Estimated Fair Value	1,499	506
Equal to or Greater than 12 Months ,Gross Unrealized Loss	116	50
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	10,011	4,856
Less than 12 months, Gross Unrealized Loss	404	321
Equal to or Greater than 12 Months, Estimated Fair Value	2,834	1,255
Equal to or Greater than 12 Months ,Gross Unrealized Loss	327	147
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	7,812	6,795
Less than 12 months, Gross Unrealized Loss	319	305
Equal to or Greater than 12 Months, Estimated Fair Value	5,377	836
Equal to or Greater than 12 Months ,Gross Unrealized Loss	502	100
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	14,419	4,619
Less than 12 months, Gross Unrealized Loss	138	87
Equal to or Greater than 12 Months, Estimated Fair Value	1,571	33
Equal to or Greater than 12 Months ,Gross Unrealized Loss	138	2
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	10,363	1,531
Less than 12 months, Gross Unrealized Loss	158	27
Equal to or Greater than 12 Months, Estimated Fair Value	417	152
Equal to or Greater than 12 Months ,Gross Unrealized Loss	30	14
ABS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	8,150	3,428
Less than 12 months, Gross Unrealized Loss	39	26
Equal to or Greater than 12 Months, Estimated Fair Value	804	2,842
Equal to or Greater than 12 Months ,Gross Unrealized Loss	20	49
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	524	273
Less than 12 months, Gross Unrealized Loss	10	6
Equal to or Greater than 12 Months, Estimated Fair Value	65	0
Equal to or Greater than 12 Months ,Gross Unrealized Loss	3	0
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	2,664	1,887
Less than 12 months, Gross Unrealized Loss	31	63
Equal to or Greater than 12 Months, Estimated Fair Value	657	612
Equal to or Greater than 12 Months ,Gross Unrealized Loss	18	39
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	58,358	24,572
Less than 12 months, Gross Unrealized Loss	1,123	829
Equal to or Greater than 12 Months, Estimated Fair Value	12,022	5,841
Equal to or Greater than 12 Months ,Gross Unrealized Loss	$ 1,025	350
Total number of securities in an unrealized loss position equal or greater than 12 months	817
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	$ 3,661	3,155
Less than 12 months, Gross Unrealized Loss	141	202
Equal to or Greater than 12 Months, Estimated Fair Value	1,202	395
Equal to or Greater than 12 Months ,Gross Unrealized Loss	$ 129	$ 51
Total number of securities in an unrealized loss position equal or greater than 12 months	162