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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting [Abstract]
Reportable segments operating gain	$ 3,360	$ 1,433	$ 5,554	$ 3,373
Net investment income	57	285	311	495
Net realized gains (losses) on financial instruments	18	11	(6)	89
Interest expense	(201)	(184)	(395)	(371)
Amortization of other intangible assets	(93)	(85)	(176)	(172)
(Loss) gain on extinguishment of debt	(3)	0	(4)	1
Income before income tax expense	$ 3,149	$ 1,453	$ 5,238	$ 3,398