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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014
Senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 2,500,000,000.0 |
Senior notes due November 1, 2024 | Senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 1,250,000,000
Stated interest rate | 4.65% | [1] |  |  |  |  | 4.65%
Treasury lock | Senior notes | Cash flow hedge contracts | Derivatives designated as hedging instruments | Portion of senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  | $ 1,000,000,000.00
Unrealized gains (losses) on cash flow hedges |  |  |  |  | $ 7,500,000 |  |
Treasury lock | Senior notes | Cash flow hedge contracts | Derivatives designated as hedging instruments | Portion of senior notes | Interest expense |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Unrealized gains (losses) on cash flow hedges | $ 5,200,000 |  |  |  |  |  |
Gain reclassified from accumulated OCI into income, effective portion | $ 200,000 |  | $ 200,000 | $ 400,000 |  |  |
[1] | The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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