pre_text: 6 . debt the following is a summary of outstanding debt ( in millions ) : .
post_text: revolving credit facilities as of december 31 , 2015 , aon plc had two committed credit facilities outstanding : its $ 400 million u.s . credit facility expiring in march 2017 ( the "2017 facility" ) and $ 900 million multi-currency u.s . credit facility expiring in february 2020 ( the "2020 facility" ) . the 2020 facility was entered into on february 2 , 2015 and replaced the previous 20ac650 million european credit facility . effective february 2 , 2016 , the 2020 facility terms were extended for 1 year and will expire in february 2021 . each of these facilities included customary representations , warranties and covenants , including financial covenants that require aon plc to maintain specified ratios of adjusted consolidated ebitda to consolidated interest expense and consolidated debt to adjusted consolidated ebitda , in each case , tested quarterly . at december 31 , 2015 , aon plc did not have borrowings under either the 2017 facility or the 2020 facility , and was in compliance with these financial covenants and all other covenants contained therein during the twelve months ended december 31 , 2015 . on november 13 , 2015 , aon plc issued $ 400 million of 2.80% ( 2.80 % ) senior notes due march 2021 . we used the proceeds of the issuance for general corporate purposes . on september 30 , 2015 , $ 600 million of 3.50% ( 3.50 % ) senior notes issued by aon corporation matured and were repaid . on may 20 , 2015 , the aon plc issued $ 600 million of 4.750% ( 4.750 % ) senior notes due may 2045 . the company used the proceeds of the issuance for general corporate purposes . on august 12 , 2014 , aon plc issued $ 350 million of 3.50% ( 3.50 % ) senior notes due june 2024 . the 3.50% ( 3.50 % ) notes due 2024 constitute a further issuance of , and were consolidated to form a single series of debt securities with , the $ 250 million of 3.50% ( 3.50 % ) notes due june 2024 that was issued by aon plc on may 20 , 2014 concurrently with aon plc's issuance of $ 550 million of 4.60% ( 4.60 % ) notes due june 2044 . aon plc used the proceeds from these issuances for working capital and general corporate purposes. .
table: As of December 31 2015 2014
table: 5.00% Senior Notes due September 2020 599 599
table: 4.75% Senior Notes due 2045 598 —
table: 3.50% Senior Notes due June 2024 597 597
table: 4.60% Senior Notes due June 2044 549 549
table: 2.875% Senior Notes due May 2026 (EUR 500M) 545 605
table: 8.205% Junior Subordinated Notes due January 2027 521 521
table: 3.125% Senior Notes due May 2016 500 500
table: 2.80% Senior Notes due 2021 399 —
table: 4.00% Senior Notes due November 2023 349 349
table: 6.25% Senior Notes due September 2040 298 298
table: 4.76% Senior Notes due March 2018 (CAD 375M) 271 322
table: 4.45% Senior Notes due May 2043 249 248
table: 4.25% Senior Notes due December 2042 196 196
table: 3.50% Senior Notes due September 2015 — 599
table: Commercial paper 50 168
table: Other 16 31
table: Total debt 5,737 5,582
table: Less short-term and current portion of long-term debt 562 783
table: Total long-term debt $5,175 $4,799
question: Analyse this data from a financial earnings document. what is the percentage change in total debt in 2015?