DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
UL and Other [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	$ 5,518	$ 5,269
Deferrals	346	537
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(217)	(288)
Balance as of end-of-year	5,647	5,518
Fixed Annuities [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	439	448
Deferrals	31	60
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(51)	(69)
Balance as of end-of-year	419	439
Retirement Plan Services Segment [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	241	239
Deferrals	15	21
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(14)	(19)
Balance as of end-of-year	242	241
Group Protection Segment [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	141	140
Deferrals	79	98
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(73)	(97)
Balance as of end-of-year	147	141
Variable Annuities [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	3,880	3,860
Deferrals	269	390
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(281)	(370)
Balance as of end-of-year	3,868	3,880
Variable Annuities [Member] | Traditional Life [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	1,286	1,146
Deferrals	148	266
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(106)	(126)
Balance as of end-of-year	$ 1,328	$ 1,286