Segment Information (Reconciliation of Operating Revenues to Total Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,624	$ 909
Annuities
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	977	928
Life
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	300	221
Run-off
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	549	554
Corporate & Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	36	82
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (238)	$ (876)