table of contents the following table presents certain payments due by the company under contractual obligations with minimum firm commitments as of september 28 , 2013 and excludes amounts already recorded on the consolidated balance sheet , except for long-term debt ( in millions ) : lease commitments the company 2019s major facility leases are typically for terms not exceeding 10 years and generally provide renewal options for terms not exceeding five additional years .
leases for retail space are for terms ranging from five to 20 years , the majority of which are for 10 years , and often contain multi-year renewal options .
as of september 28 , 2013 , the company 2019s total future minimum lease payments under noncancelable operating leases were $ 4.7 billion , of which $ 3.5 billion related to leases for retail space .
purchase commitments with outsourcing partners and component suppliers the company utilizes several outsourcing partners to manufacture sub-assemblies for the company 2019s products and to perform final assembly and testing of finished products .
these outsourcing partners acquire components and build product based on demand information supplied by the company , which typically covers periods up to 150 days .
the company also obtains individual components for its products from a wide variety of individual suppliers .
consistent with industry practice , the company acquires components through a combination of purchase orders , supplier contracts , and open orders based on projected demand information .
where appropriate , the purchases are applied to inventory component prepayments that are outstanding with the respective supplier .
as of september 28 , 2013 , the company had outstanding off-balance sheet third- party manufacturing commitments and component purchase commitments of $ 18.6 billion .
other obligations in addition to the off-balance sheet commitments mentioned above , the company had outstanding obligations of $ 1.3 billion as of september 28 , 2013 , that consisted mainly of commitments to acquire capital assets , including product tooling and manufacturing process equipment , and commitments related to advertising , research and development , internet and telecommunications services and other obligations .
the company 2019s other non-current liabilities in the consolidated balance sheets consist primarily of deferred tax liabilities , gross unrecognized tax benefits and the related gross interest and penalties .
as of september 28 , 2013 , the company had non-current deferred tax liabilities of $ 16.5 billion .
additionally , as of september 28 , 2013 , the company had gross unrecognized tax benefits of $ 2.7 billion and an additional $ 590 million for gross interest and penalties classified as non-current liabilities .
at this time , the company is unable to make a reasonably reliable estimate of the timing of payments in individual years in connection with these tax liabilities ; therefore , such amounts are not included in the above contractual obligation table .
indemnification the company generally does not indemnify end-users of its operating system and application software against legal claims that the software infringes third-party intellectual property rights .
other agreements entered into by payments due in than 1 payments due in payments due in payments due in than 5 years total .

Payments Due in Less  Than1 Year
Payments Due in  1-3  Years
Payments  Due in  4-5  Years
Payments Due in More  Than5 Years
Total
Long-term debt
$0
$2,500
$6,000
$8,500
$17,000
Operating leases
610
1,200
1,056
1,855
4,721
Purchase obligations
18,616
0
0
0
18,616
Other obligations
1,081
248
16
3
1,348
Total
$20,307
$3,948
$7,072
$10,358
$41,685

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Question: Analyse this data from a financial earnings document. as of september 28 , 2013 , the company had non-current deferred tax liabilities of $ 16.5 billion . what was the difference between this and the balance of gross unrecognized tax benefits , in billions?
Choices:
19.2
0
25.3
6.1
13.8
Correct choice index: 4