Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details 4) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
GMDB and GGU [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		$ 19	$ 17	$ 16
Incurred claims		2	8	5
Paid claims		(5)	(6)	(4)
Balance, at the end of the period		16	19	17
GMIB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		8	6	8
Incurred claims		(1)	2	0
Paid claims		0	0	(2)
Balance, at the end of the period		7	8	6
GMWB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		875	463	1,017
Incurred claims	[1]	587	412	(554)
Paid claims		0	0	0
Balance, at the end of the period		1,462	875	463
GMAB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		(19)	(80)	(24)
Incurred claims	[1]	(20)	61	(56)
Paid claims		0	0	0
Balance, at the end of the period		(39)	(19)	(80)
UL [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		659	489	434
Incurred claims		141	201	84
Paid claims		(42)	(31)	(29)
Balance, at the end of the period		$ 758	$ 659	$ 489

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