Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 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]	2,842
Incurred related to:
Current year		1,640	909
Interest		85	53
All other incurred		(159)	(85)
Total incurred		1,566	877
Paid related to:
Current year		(663)	(458)
Prior years		(796)	(440)
Total paid		(1,459)	(898)
Net balance as of end-of-period		5,114	2,152
Reinsurance recoverable		141	57
Balance as of end-of-period		$ 5,255	$ 2,209

[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.