Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details 4) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
GMDB and GGU [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		$ 17	$ 16	$ 14
Incurred claims		8	5	11
Paid claims		(6)	(4)	(9)
Balance, at the end of the period		19	17	16
GMIB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		6	8	8
Incurred claims		2		1
Paid claims			(2)	(1)
Balance, at the end of the period		8	6	8
GMWB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	[1]	463	1,017	1,057
Incurred claims	[1]	412	(554)	(40)
Balance, at the end of the period	[1]	875	463	1,017
GMAB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	[1]	(80)	(24)	0
Incurred claims	[1]	61	(56)	(23)
Paid claims	[1]			(1)
Balance, at the end of the period	[1]	(19)	(80)	(24)
UL [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		489	434	332
Incurred claims		201	84	127
Paid claims		(31)	(29)	(25)
Balance, at the end of the period		$ 659	$ 489	$ 434

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