Segment Information (Reconciliation Of Reportable Segment Operating Gain To Income From Continuing Operations Before Income Taxes In The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Reportable segments operating gain	$ 6,360	$ 5,999	$ 5,426
Net investment income	877	1,005	970
Net realized gains (losses) on financial instruments	182	67	(206)
Interest expense	(784)	(746)	(753)
Amortization of other intangible assets	(361)	(338)	(358)
(Loss) gain on extinguishment of debt	(36)	(2)	(11)
Income from continuing operations before income tax expense	$ 6,238	$ 5,985	$ 5,068