Segment Information (Reconciliation of Operating Revenues to Total Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,510	$ 1,781	$ 3,134	$ 2,690
Annuities
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	985	960	1,962	1,888
Life
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	278	265	578	486
Run-off
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	509	531	1,058	1,085
Corporate & Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	31	73	67	155
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (293)	$ (48)	$ (531)	$ (924)