MRBs (Summary Of Balances Of Changes In Net MRB (Assets) Liabilities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Market Risk Benefit [Line Items]
Balance as of beginning-of-year	$ (729)
Balance as of end-of-period	(2,723)	$ (729)
Variable Annuities [Member]
Market Risk Benefit [Line Items]
Balance as of beginning-of-year	(662)	2,398
Less: Effect of cumulative changes in non-performance risk	(2,173)	(2,425)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	1,511	4,823
Issuances	3	12
Attributed fees collected	1,127	1,571
Benefit payments	(49)	(63)
Effect of changes in interest rates	(2,347)	(9,346)
Effect of changes in equity markets	(1,430)	4,293
Effect of changes in equity index volatility	(358)	(225)
In-force updates and other changes in MRBs	182	661
Actual policyholder behavior different from expected behavior	(33)	(158)
Effect of changes in future expected assumptions	(66)	(57)
Balance as of end-of-year, before the effect of changes in non-performance risk	(1,460)	1,511
Effect of changes in non-performance risk	(1,213)	(2,173)
Balance as of end-of-period	(2,673)	(662)
Less: ceded MRB assets (liabilities)	(303)	(193)
Balance as of end-of-period, net of reinsurance	$ (2,370)	$ (469)
Weighted-average age of policyholders (years)	72 years	71 years
Net amount at risk	$ 6,235	$ 7,974
Fixed Annuities [Member]
Market Risk Benefit [Line Items]
Balance as of beginning-of-year	(45)	114
Less: Effect of cumulative changes in non-performance risk	(40)	(44)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(5)	158
Attributed fees collected	23	32
Effect of changes in interest rates	(66)	(232)
Effect of changes in equity markets	(5)	12
Effect of changes in equity index volatility	6	14
In-force updates and other changes in MRBs	4	10
Actual policyholder behavior different from expected behavior	70	1
Effect of changes in future expected assumptions	15
Balance as of end-of-year, before the effect of changes in non-performance risk	42	(5)
Effect of changes in non-performance risk	(59)	(40)
Balance as of end-of-period	(17)	(45)
Balance as of end-of-period, net of reinsurance	$ (17)	$ (45)
Weighted-average age of policyholders (years)	68 years	68 years
Net amount at risk	$ 188	$ 171
Retirement Plan Services [Member]
Market Risk Benefit [Line Items]
Balance as of beginning-of-year	(22)	(1)
Less: Effect of cumulative changes in non-performance risk	(2)	(13)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(20)	12
Issuances		(3)
Attributed fees collected	4	6
Effect of changes in interest rates	(7)	(55)
Effect of changes in equity markets	(6)	18
Effect of changes in equity index volatility	(3)	(1)
In-force updates and other changes in MRBs		3
Effect of changes in future expected assumptions	(2)
Balance as of end-of-year, before the effect of changes in non-performance risk	(34)	(20)
Effect of changes in non-performance risk	1	(2)
Balance as of end-of-period	(33)	(22)
Balance as of end-of-period, net of reinsurance	$ (33)	$ (22)
Weighted-average age of policyholders (years)	63 years	63 years
Net amount at risk	$ 9	$ 15