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Summary of Debt Obligations (Detail) - USD ($)
$ in Millions

Dec. 31, 2017

Dec. 31, 2016

Debt Disclosure [Line Items]

Amounts outstanding

$ 29,536.4

$ 25,955.7

Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net

120.5

110.0

Debt Obligations Before Fair Value Adjustments

Debt Disclosure [Line Items]

Amounts outstanding

29,663.1

^[1]

26,065.7

Derivatives in Fair Value Hedging Relationships

Debt Disclosure [Line Items]

Amounts outstanding

^[2]

(6.2)

0.0

Currency US Dollar

Debt Disclosure [Line Items]

Amounts outstanding

$ 17,283.3

$ 17,139.5

Currency US Dollar | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

4.00%

4.00%

Amounts outstanding

$ 15,533.3

$ 13,889.7

Currency US Dollar | Floating Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

4.30%

3.40%

Amounts outstanding

$ 1,750.0

$ 3,249.8

Currency Euro

Debt Disclosure [Line Items]

Amounts outstanding

$ 9,770.0

$ 7,298.4

Currency Euro | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

1.60%

1.70%

Amounts outstanding

$ 8,446.6

$ 6,127.5

Currency Euro | Floating Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

0.00%

0.30%

Amounts outstanding

$ 1,323.4

$ 1,170.9

Currency Japanese Yen | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

2.90%

2.90%

Amounts outstanding

$ 110.9

$ 106.9

Currency British Pound Sterling [Member] | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

5.30%

5.30%

Amounts outstanding

$ 1,008.9

$ 921.3

Currency Canadian Dollar [Member] | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

^[3]

3.10%

0.00%

Amounts outstanding

$ 793.8

$ 0.0

Foreign currency denominated debt

Debt Disclosure [Line Items]

Amounts outstanding

^[4]

$ 696.2

$ 599.6

Foreign currency denominated debt | Fixed Rate Debt

Debt Disclosure [Line Items]

Interest rates

0.80%

0.50%

Amounts outstanding

$ 451.5

$ 416.9

Foreign currency denominated debt | Floating Rate Debt

Debt Disclosure [Line Items]

Interest rates

2.30%

2.20%

Amounts outstanding

$ 244.7

$ 182.7

[1]	Aggregate maturities for 2017 debt balances, before fair value adjustments and deferred debt costs, are as follows (in millions): 2018–$2,024.6; 2019–$2,121.2; 2020–$2,432.3; 2021–$1,717.0; 2022–$2,311.2; Thereafter–$19,056.8. These amounts include a reclassification of short-term obligations totaling $2.0 billion to long-term obligations as they are supported by a long-term line of credit agreement expiring in December 2019
[2]	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
[3]	Weighted-average effective rate, computed on a semi-annual basis.
[4]	Primarily consists of Swiss Francs and Korean Won.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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