Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year		$ 5,335	$ 2,222	$ 2,242
Reinsurance recoverable		143	57	69
Net balance as of beginning-of-year		5,192	2,165	2,173
Business acquired	[1]		2,842
Incurred related to:
Current year		3,193	2,531	1,346
Interest		151	120	69
All other incurred	[2]	(308)	(208)	(76)
Total incurred		3,036	2,443	1,339
Paid related to:
Current year		(1,518)	(1,197)	(798)
Prior years		(1,310)	(1,061)	(549)
Total paid		(2,828)	(2,258)	(1,347)
Net balance as of end-of-year		5,400	5,192	2,165
Reinsurance recoverable		152	143	57
Balance as of end-of-year		$ 5,552	$ 5,335	$ 2,222

[1] Represents acquired group life and disability reserves, net, as of May 1, 2018. See Note 3 for additional information.

[2] All other incurred is primarily impacted by the level of claim resolutions in the period compared to that which is expected by the reserve assumption. A negative number implies a favorable result where claim resolutions were more favorable than assumed. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the long-term life of the block of claims. It will vary from actual experience in any one period, both favorably and unfavorably