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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Issued notes	$ 400
Forecasted debt issuance variable rate period	3-month LIBOR
Ineffective portion of the cash flow hedges	2
Loss from the termination of the interest rate swap agreement	21	23
Percentage of interest rate swap effectiveness		100.00%
Interest rate swap recorded in other comprehensive income	23
Decrease in interest expense due to amortization of net gains on termination of interest rate swap agreement	6	10	12
Additional expense related to the cash flow hedge terminated	$ 2

The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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