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Changes in Level 3 Recurring Fair Value Measurements (Detail) (Notes Receivable, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Notes Receivable
Beginning of period	$ 116	$ 103
Accretion of value (interest income)	4	3
Other	(1)
End of period	$ 119	$ 106

Amount of increase (decrease) of assets measured at fair value on a recurring basis using unobservable inputs (level 3). Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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