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Effect of Changes in Fair Value Related to Derivative Instruments on Consolidated Statements of Income (Detail) (Not Designated as Hedging Instrument, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative [Line Items]
Effect on income of derivative instruments		$ 1
Note Hedge \| Noncash convertible debt related expense
Derivative [Line Items]
Effect on income of derivative instruments	27	(9)
Cash Conversion Option \| Noncash convertible debt related expense
Derivative [Line Items]
Effect on income of derivative instruments	$ (27)	$ 10

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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