Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year		$ 5,335	$ 2,222
Reinsurance recoverable		143	57
Net balance as of beginning-of-year		5,192	2,165
Incurred related to:
Current year		803	364
Interest		41	19
All other incurred	[1]	(85)	(58)
Total incurred		759	325
Paid related to:
Current year		(215)	(126)
Prior years		(482)	(213)
Total paid		(697)	(339)
Net balance as of end-of-period		5,254	2,151
Reinsurance recoverable		143	56
Balance as of end-of-period		$ 5,397	$ 2,207

[1] 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.