DAC, VOBA, DSI, and DFEL (DSI) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
UL and Other [Member]
Changes in DSI [Roll Forward]
Balance as of beginning-of-year	$ 30	$ 31
Deferrals	1	1
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(2)	(2)
Balance as of end-of-year	29	30
Fixed Annuities [Member]
Changes in DSI [Roll Forward]
Balance as of beginning-of-year	23	27
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(3)	(4)
Balance as of end-of-year	20	23
Retirement Plan Services Segment [Member]
Changes in DSI [Roll Forward]
Balance as of beginning-of-year	17	14
Deferrals	5	4
Amortization, net of interest:
Amortization, excluding unlocking, net of interest		(1)
Balance as of end-of-year	22	17
Variable Annuities [Member]
Changes in DSI [Roll Forward]
Balance as of beginning-of-year	167	181
Deferrals	3	2
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(11)	(16)
Balance as of end-of-year	$ 159	$ 167