Segment Information (Reconciliation Of Reportable Segments Operating Gain To Income Before Income Tax Expense Included In The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Reportable segments operating gain	$ 1,433	$ 1,559	$ 3,373	$ 3,427
Net investment income	285	229	495	458
Net realized gains (losses) on financial instruments	11	4	89	(22)
Other-than-temporary impairment losses recognized in income	(7)	(4)	(17)	(12)
Interest expense	(184)	(192)	(371)	(376)
Amortization of other intangible assets	(85)	(93)	(172)	(173)
Gain (loss) on Extinguishment of Debt	0	1	1	(18)
Income before income tax expense	$ 1,453	$ 1,504	$ 3,398	$ 3,284