Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Net gain/(loss) recognized in income	$ 9	$ 6	$ 66	$ 25
Insured swaps [Member] | Net gains (losses) on financial instruments at fair value and foreign exchange [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income			1	0
Interest Rate Swap [Member] | Net gains (losses) on financial instruments at fair value and foreign exchange [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	23	5	79	22
Currency swaps-VIE [Member] | Net gains (losses) on financial instruments at fair value and foreign exchange-VIE [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	$ (14)	$ 1	$ (14)	$ 3