Summary of Debt Obligations (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Debt Disclosure [Line Items]
Amounts outstanding	$ 14,989.7	[1]	$ 14,129.8	[1]
Debt Obligations Before Fair Value Adjustments
Debt Disclosure [Line Items]
Amounts outstanding	14,985.0	[2]	14,117.0	[2]
Derivatives in Fair Value Hedging Relationships
Debt Disclosure [Line Items]
Amounts outstanding	4.7	[3]	12.8	[3]
Currency US Dollar
Debt Disclosure [Line Items]
Amounts outstanding	9,054.7		8,360.6
Currency US Dollar | Fixed Rate Debt
Debt Disclosure [Line Items]
Interest rates	4.50%	[4]	4.60%	[4]
Amounts outstanding	6,604.7		6,460.6
Currency US Dollar | Floating Rate Debt
Debt Disclosure [Line Items]
Interest rates	3.20%	[4]	3.20%	[4]
Amounts outstanding	2,450.0		1,900.0
Currency Euro
Debt Disclosure [Line Items]
Amounts outstanding	3,335.0		3,242.1
Currency Euro | Fixed Rate Debt
Debt Disclosure [Line Items]
Interest rates	3.20%	[4]	3.30%	[4]
Amounts outstanding	3,014.7		2,884.9
Currency Euro | Floating Rate Debt
Debt Disclosure [Line Items]
Interest rates	2.90%	[4]	2.80%	[4]
Amounts outstanding	320.3		357.2
Currency Japanese Yen
Debt Disclosure [Line Items]
Amounts outstanding	312.9		878.5
Currency Japanese Yen | Fixed Rate Debt
Debt Disclosure [Line Items]
Interest rates	2.90%	[4]	2.90%	[4]
Amounts outstanding	104.3		118.7
Currency Japanese Yen | Floating Rate Debt
Debt Disclosure [Line Items]
Interest rates	0.30%	[4]	0.40%	[4]
Amounts outstanding	208.6		759.8
Currency British Pound Sterling [Member] | Fixed Rate Debt
Debt Disclosure [Line Items]
Interest rates	5.30%	[4]	6.00%	[4]
Amounts outstanding	1,163.3		744.3
Currency Chinese Renminbi [Member] | Floating Rate Debt
Debt Disclosure [Line Items]
Interest rates	5.60%	[4]	5.40%	[4]
Amounts outstanding	630.1		525.1
Foreign currency denominated debt
Debt Disclosure [Line Items]
Amounts outstanding	489.0	[5]	366.4	[5]
Foreign currency denominated debt | Fixed Rate Debt
Debt Disclosure [Line Items]
Interest rates	2.10%	[4]	1.90%	[4]
Amounts outstanding	268.3		281.0
Foreign currency denominated debt | Floating Rate Debt
Debt Disclosure [Line Items]
Interest rates	4.00%	[4]	3.60%	[4]
Amounts outstanding	$ 220.7		$ 85.4

[1] The net increase in 2014 was primarily due to net issuances of $1.5 billion partly offset by changes in exchange rates on foreign currency denominated debt of $663 million.

[2] Aggregate maturities for 2014 debt balances, before fair value adjustments, were as follows (in millions): 2015–$0.0; 2016–$830.7; 2017–$1,069.1; 2018–$1,005.0; 2019–$2,979.3; Thereafter–$9,100.9. These amounts include a reclassification of short-term obligations totaling $2.2 billion to long-term obligations as they are supported by a long-term line of credit agreement expiring in December 2019.

[3] The carrying value of underlying items in fair value hedges, in this case debt obligations, are adjusted for fair value changes to the extent they are attributable to the risk designated as being hedged. The related hedging instrument is also recorded at fair value in prepaid expenses and other current assets, miscellaneous other assets or other long-term liabilities.

[4] Weighted-average effective rate, computed on a semi-annual basis.

[5] Primarily consists of Swiss Francs and Korean Won.