Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
GMDB and GGU [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		$ 24	$ 16
Incurred claims		9	5
Paid claims		(2)	(4)
Ending Balance		31	17
GMIB
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		6	7
Incurred claims		0	1
Paid claims			(1)
Ending Balance		6	7
GMWB
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance	[1]	3,049	1,462
Incurred claims	[1]	(900)	2,387
Ending Balance	[1]	2,149	3,849
GMAB
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance	[1]	1	(39)
Incurred claims	[1]	(21)	69
Ending Balance	[1]	(20)	30
UL
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		916	758
Incurred claims		69	65
Paid claims		(16)	(24)
Ending Balance		$ 969	$ 799

[1] The incurred claims for GMWB and GMAB include the change in the fair value of the liabilities (contra liabilities) less paid claims.