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Derivatives (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Dec. 31, 2012
Swap Agreement One |  |
Swaps: |  |
Original variable, rate debt amount | $ 50 |
Agreement date | Jun. 21, 2006 |
Effective date | Jul. 10, 2006 |
Expiration date | Jul. 10, 2013 |
Designed cash flow hedge date | Jun. 09, 2006 |
Swap Agreement Three |  |
Swaps: |  |
Original variable, rate debt amount | 300 |
Agreement date | Aug. 16, 2006 |
Effective date | Aug. 18, 2006 |
Expiration date | Aug. 10, 2018 |
Designed cash flow hedge date | Aug. 04, 2006 |
Swap Agreement Four |  |
Swaps: |  |
Original variable, rate debt amount | 30 |
Agreement date | Feb. 09, 2007 |
Effective date | Feb. 12, 2007 |
Expiration date | Feb. 10, 2014 |
Designed cash flow hedge date | Feb. 09, 2007 |
Swap Agreement Five |  |
Swaps: |  |
Original variable, rate debt amount | 20 |
Agreement date | Mar. 08, 2007 |
Effective date | Mar. 12, 2007 |
Expiration date | Mar. 10, 2014 |
Designed cash flow hedge date | Mar. 08, 2007 |
Swap Agreement Six |  |
Swaps: |  |
Original variable, rate debt amount | 20 |
Agreement date | Mar. 08, 2007 |
Effective date | Mar. 12, 2007 |
Expiration date | Mar. 10, 2014 |
Designed cash flow hedge date | Mar. 08, 2007 |
Swap Agreement Seven |  |
Swaps: |  |
Original variable, rate debt amount | 19 | [1]
Agreement date | Apr. 08, 2008 |
Effective date | Aug. 15, 2008 |
Expiration date | Jun. 15, 2015 |
Designed cash flow hedge date | Mar. 31, 2008 |
Swap Agreement Eight |  |
Swaps: |  |
Original variable, rate debt amount | 19 |
Agreement date | Aug. 27, 2008 |
Effective date | Aug. 29, 2008 |
Expiration date | Jul. 10, 2015 |
Designed cash flow hedge date | Apr. 10, 2008 |
Swap Agreement Nine |  |
Swaps: |  |
Original variable, rate debt amount | 30 |
Agreement date | Sep. 24, 2008 |
Effective date | Sep. 30, 2008 |
Expiration date | Sep. 10, 2015 |
Designed cash flow hedge date | Sep. 24, 2008 |
Swap Agreement Ten |  |
Swaps: |  |
Original variable, rate debt amount | 15 | [1]
Agreement date | Mar. 24, 2009 |
Effective date | Mar. 30, 2009 |
Expiration date | Mar. 30, 2016 |
Designed cash flow hedge date | Mar. 25, 2009 |
Swap Agreement Eleven |  |
Swaps: |  |
Original variable, rate debt amount | 15 | [1]
Agreement date | Jul. 06, 2010 |
Effective date | Aug. 15, 2010 |
Expiration date | Jul. 15, 2017 |
Designed cash flow hedge date | Jul. 06, 2010 |
Swap Agreement Twelve |  |
Swaps: |  |
Original variable, rate debt amount | 25 | [1]
Agreement date | Apr. 26, 2011 |
Effective date | Jun. 01, 2011 |
Expiration date | Jun. 01, 2018 |
Designed cash flow hedge date | Jul. 01, 2011 |
Swap Agreement Thirteen |  |
Swaps: |  |
Original variable, rate debt amount | 50 | [1]
Agreement date | Jul. 29, 2011 |
Effective date | Aug. 15, 2011 |
Expiration date | Aug. 15, 2018 |
Designed cash flow hedge date | Jul. 29, 2011 |
Swap Agreement Fourteen |  |
Swaps: |  |
Original variable, rate debt amount | 20 | [1]
Agreement date | Aug. 03, 2011 |
Effective date | Sep. 12, 2011 |
Expiration date | Sep. 10, 2018 |
Designed cash flow hedge date | Aug. 03, 2011 |
Swap Agreement Fifteen |  |
Swaps: |  |
Original variable, rate debt amount | 15 | [2]
Agreement date | Mar. 27, 2012 |
Effective date | Mar. 28, 2012 |
Expiration date | Mar. 28, 2019 |
Designed cash flow hedge date | Mar. 26, 2012 |
Swap Agreement Sixteen |  |
Swaps: |  |
Original variable, rate debt amount | $ 25 |
Agreement date | Apr. 13, 2012 |
Effective date | Apr. 16, 2012 |
Expiration date | Apr. 01, 2019 |
Designed cash flow hedge date | Apr. 12, 2012 |
[1] | forward swap
[2] | operating lease

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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