Long-Term Debt - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Nov. 30, 2012 tranche
Debt Instrument [Line Items]
Carrying amount of other long term debt including current portion	$ 1,000,000,000	$ 967,000,000
Senior Notes
Debt Instrument [Line Items]
Face amount			3,000,000,000
Number of tranches of debt issued			3
Unamortized discount	21,000,000	23,000,000
Interest payment frequency	semi-annually in arrears in May and November
Total estimated fair value of notes	$ 2,900,000,000	$ 2,900,000,000
0.65% Notes due on November 27, 2015
Debt Instrument [Line Items]
Effective interest yields	0.84%
1.20% Notes due on November 29, 2017
Debt Instrument [Line Items]
Effective interest yields	1.38%
2.50% Notes due on November 29, 2022
Debt Instrument [Line Items]
Effective interest yields	2.66%
Other Long Term Debt
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	5.60%	5.50%