Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Comprehensive Income (Loss) [Line Items]
Reclassification, Before Tax		$ 2	$ 3	$ 7
Reclassification, Tax Effect			(1)	(2)
Reclassification, Net of Tax		2	2	6
Total, Before Tax	(343)	(77)	(1,364)	(125)
Total, Tax Effect	72	16	285	26
Total other comprehensive income (loss), net of tax	(271)	(61)	(1,078)	(99)
URA(D) On Securities [Member]
Comprehensive Income (Loss) [Line Items]
Before Tax	(357)	(55)	(1,376)	(139)
Tax Effect	75	12	288	29
Net of Tax	(282)	(43)	(1,087)	(110)
Reclassification, Before Tax	50	3	61	13
Reclassification, Tax Effect	(11)	(1)	(13)	(3)
Reclassification, Net of Tax	40	2	48	10
Total other comprehensive income (loss), net of tax	(242)	(41)	(1,039)	(100)
Foreign Currency Translation Adjustments [Member]
Comprehensive Income (Loss) [Line Items]
Before Tax	(37)	(26)	(52)	(6)
Tax Effect	8	5	11	1
Net of Tax	(29)	(21)	(41)	(5)
Total other comprehensive income (loss), net of tax	(29)	(21)	(41)	(5)
Benefit Plan Net Gain (Loss) [Member]
Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), net of tax		$ 2	$ 2	$ 6