Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
GMDB and GGU [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		$ 24	$ 16
Incurred claims		3	5
Paid claims		(1)	(2)
Ending Balance		26	19
GMIB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		6	7
Incurred claims		0	2
Paid claims		0
Ending Balance		6	9
GMWB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance	[1]	3,049	1,462
Incurred claims	[1]	(1,570)	2,437
Ending Balance	[1]	1,479	3,899
GMAB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance	[1]	1	(39)
Incurred claims	[1]	(23)	127
Ending Balance	[1]	(22)	88
UL [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Beginning Balance		916	758
Incurred claims		32	32
Paid claims		(8)	(12)
Ending Balance		$ 940	$ 778

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