Liability For Unpaid Claims (Schedule Of Reconciliation) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future contract benefits	$ 33,988		$ 22,547
Liability for unpaid claims	5,255	$ 2,222	2,209	$ 2,242
Life And Annuity Reserves And Claims Due [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Less adjustments	27,193		18,698
Accident And Health Active Life Reserves [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Less adjustments	$ 1,540		$ 1,640