Segment Information (Reconciliation of Operating Revenues to Total Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,238	$ 1,694	$ 4,372	$ 4,384
Annuities
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	995	901	2,957	2,789
Life
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	307	288	885	774
Run-off
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	536	549	1,594	1,634
Corporate & Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	41	48	108	203
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (641)	$ (92)	$ (1,172)	$ (1,016)