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Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Jun. 30, 2012 | Jun. 30, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 2,174 | $ 2,236 | $ 2,134
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 851 | 895 | 782
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1,323 | 1,341 | 1,352
Common stock - U.S. companies [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 182 | 184 | 180
Common stock - U.S. companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 182 | 184 | 180
Common stock - International companies [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 | 2 | 5
Common stock - International companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 | 2 | 5
Equity mutual funds - Emerging markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 81 | 77 | 70
Equity mutual funds - Emerging markets [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 81 | 77 | 70
Equity mutual funds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 110 | 109 | 99
Equity mutual funds - International [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 110 | 109 | 99
Equity mutual funds - Large cap U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 386 | 415 | 378
Equity mutual funds - Large cap U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 386 | 415 | 378
Equity mutual funds - Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 |  | 1
Equity mutual funds - Other [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 |  | 1
Common collective trust funds - International equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 406 | 372 | 341
Common collective trust funds - International equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 406 | 372 | 341
Common collective trust funds - Large cap U.S. equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 17 | 16 | 24
Common collective trust funds - Large cap U.S. equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 17 | 16 | 24
Common collective trust funds - Fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 373 | 409 | 444
Common collective trust funds - Fixed income [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 373 | 409 | 444
Common collective trust funds - Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 47 | 59 | 60
Common collective trust funds - Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 47 | 59 | 60
Debt instruments - Corporate bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 437 | 447 | 442
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 437 | 447 | 442
Debt instruments - U.S. Treasury instruments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 90 | 108 | 49
Debt instruments - U.S. Treasury instruments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 90 | 108 | 49
Debt instruments - U.S. government agency, state and local government bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 39 | 33 | 35
Debt instruments - U.S. government agency, state and local government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 39 | 33 | 35
Other Debt Instruments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4 | 5 | 6
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 4 | $ 5 | $ 6

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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