Liability For Unpaid Claims (Schedule Of Reconciliation) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future contract benefits	$ 33,718		$ 22,293
Liability for unpaid claims	5,176	$ 2,222	2,222	$ 2,242
Life And Annuity Reserves And Claims Due [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Less adjustments	26,975		18,411
Accident And Health Active Life Reserves [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Less adjustments	$ 1,567		$ 1,660