Liability For Unpaid Claims (Changes In Liability For Unpaid Claims And Claim Adjustment Expenses) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year		$ 2,222	$ 2,242
Reinsurance recoverable		57	69
Net balance as of beginning-of-year		2,165	2,173
Business acquired	[1]	2,836
Incurred related to:
Current year		986	686
Interest		50	37
All other incurred		(87)	(45)
Total incurred		949	678
Paid related to:
Current year		(393)	(343)
Prior years		(517)	(356)
Total paid		(910)	(699)
Net balance as of end-of-period		5,040	2,152
Reinsurance recoverable		136	70
Balance as of end-of-period		$ 5,176	$ 2,222

[1] Represents Liberty group life and disability reserves, net, as of May 1, 2018, subject to finalization of acquisition date fair values. See Note 3 for additional information.