Long-Term Debt Obligations (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Other long-term debt	$ 691	$ 384
Long-term debt	3,691	384
Less current portion of long-term debt	(579)	(129)
Face value of long-term debt	3,112	255
0.65% Notes due on November 27, 2015
Debt Instrument [Line Items]
Long-term debt	750
1.20% Notes due on November 29, 2017
Debt Instrument [Line Items]
Long-term debt	1,000
2.50% Notes due on November 29, 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,250