Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Net gain/(loss) recognized in income	$ 27	$ (19)	$ 57	$ 18
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	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	26	(18)	56	17
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	$ 0	$ (1)	$ 0	$ 1